diff --git a/custom_components/octopus_energy/config/target_rates.py b/custom_components/octopus_energy/config/target_rates.py
index 47dbc54d..90755618 100644
--- a/custom_components/octopus_energy/config/target_rates.py
+++ b/custom_components/octopus_energy/config/target_rates.py
@@ -147,10 +147,6 @@ def validate_target_rate_config(data, account_info, now):
     if data[CONFIG_TARGET_HOURS] % 0.5 != 0:
       errors[CONFIG_TARGET_HOURS] = "invalid_target_hours"
 
-  if CONFIG_TARGET_HOURS not in errors:
-    if data[CONFIG_TARGET_HOURS] < 0.5:
-      errors[CONFIG_TARGET_HOURS] = "invalid_target_hours"
-
   if CONFIG_TARGET_START_TIME in data and data[CONFIG_TARGET_START_TIME] is not None:
     matches = re.search(REGEX_TIME, data[CONFIG_TARGET_START_TIME])
     if matches is None:
diff --git a/custom_components/octopus_energy/target_rates/__init__.py b/custom_components/octopus_energy/target_rates/__init__.py
index ed14e3c3..7bf391c1 100644
--- a/custom_components/octopus_energy/target_rates/__init__.py
+++ b/custom_components/octopus_energy/target_rates/__init__.py
@@ -90,7 +90,7 @@ def calculate_continuous_times(
     max_rate = None,
     weighting: list = None
   ):
-  if (applicable_rates is None):
+  if (applicable_rates is None or target_hours <= 0):
     return []
   
   applicable_rates.sort(key=__get_valid_to, reverse=find_last_rates)
@@ -115,7 +115,7 @@ def calculate_continuous_times(
       continue
 
     continuous_rates = [rate]
-    continuous_rates_total = rate["value_inc_vat"] * (weighting[0] if weighting is not None else 1)
+    continuous_rates_total = rate["value_inc_vat"] * (weighting[0] if weighting is not None and len(weighting) > 0 else 1)
     
     for offset in range(1, total_required_rates):
       if (index + offset) < applicable_rates_count:
diff --git a/custom_components/octopus_energy/translations/en.json b/custom_components/octopus_energy/translations/en.json
index 59e7c88e..5f4ad701 100644
--- a/custom_components/octopus_energy/translations/en.json
+++ b/custom_components/octopus_energy/translations/en.json
@@ -69,7 +69,7 @@
       "server_error": "Failed to connect to OE servers. Please try again later",
       "account_not_found": "Invalid API key or account id specified",
       "value_greater_than_zero": "Value must be greater or equal to 1",
-      "invalid_target_hours": "Target hours must be in half hour increments (e.g. 0.5 = 30 minutes; 1 = 60 minutes) and a minimum of 0.5.",
+      "invalid_target_hours": "Target hours must be in half hour increments (e.g. 0.5 = 30 minutes; 1 = 60 minutes).",
       "invalid_target_name": "Name must only include lower case alpha characters and underscore (e.g. my_target)",
       "invalid_target_time": "Must be in the format HH:MM",
       "invalid_offset": "Offset must be in the form of HH:MM:SS with an optional negative symbol",
@@ -143,7 +143,7 @@
       "server_error": "Failed to connect to OE servers. Please try again later",
       "account_not_found": "Invalid API key or account id specified",
       "value_greater_than_zero": "Value must be greater or equal to 1",
-      "invalid_target_hours": "Target hours must be in half hour increments (e.g. 0.5 = 30 minutes; 1 = 60 minutes) and a minimum of 0.5.",
+      "invalid_target_hours": "Target hours must be in half hour increments (e.g. 0.5 = 30 minutes; 1 = 60 minutes).",
       "invalid_target_time": "Must be in the format HH:MM",
       "invalid_offset": "Offset must be in the form of HH:MM:SS with an optional negative symbol",
       "invalid_hours_time_frame": "The target hours do not fit in the elected target time frame",
diff --git a/tests/unit/config/test_validate_target_rate_config.py b/tests/unit/config/test_validate_target_rate_config.py
index bbde0c90..fca38f3f 100644
--- a/tests/unit/config/test_validate_target_rate_config.py
+++ b/tests/unit/config/test_validate_target_rate_config.py
@@ -132,8 +132,39 @@ async def test_when_config_has_invalid_name_then_errors_returned(name, tariff):
 
 @pytest.mark.asyncio
 @pytest.mark.parametrize("hours,tariff",[
-  ("", non_agile_tariff),
   ("0", non_agile_tariff),
+  ("0", agile_tariff),
+])
+async def test_when_config_has_valid_hours_then_no_errors_returned(hours, tariff):
+  # Arrange
+  data = {
+    CONFIG_TARGET_TYPE: CONFIG_TARGET_TYPE_CONTINUOUS,
+    CONFIG_TARGET_NAME: "test",
+    CONFIG_TARGET_MPAN: mpan,
+    CONFIG_TARGET_HOURS: hours,
+    CONFIG_TARGET_START_TIME: "00:00",
+    CONFIG_TARGET_END_TIME: "16:00",
+    CONFIG_TARGET_OFFSET: "-00:00:00",
+  }
+  account_info = get_account_info(tariff)
+
+  # Act
+  errors = validate_target_rate_config(data, account_info, now)
+
+  # Assert
+  assert CONFIG_TARGET_HOURS not in errors
+  assert CONFIG_TARGET_NAME not in errors
+  assert CONFIG_TARGET_MPAN not in errors
+  assert CONFIG_TARGET_START_TIME not in errors
+  assert CONFIG_TARGET_END_TIME not in errors
+  assert CONFIG_TARGET_OFFSET not in errors
+  assert CONFIG_TARGET_MIN_RATE not in errors
+  assert CONFIG_TARGET_MAX_RATE not in errors
+  assert CONFIG_TARGET_WEIGHTING not in errors
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("hours,tariff",[
+  ("", non_agile_tariff),
   ("-1.0", non_agile_tariff),
   ("s", non_agile_tariff),
   ("1.01", non_agile_tariff),
@@ -141,7 +172,6 @@ async def test_when_config_has_invalid_name_then_errors_returned(name, tariff):
   ("1.51", non_agile_tariff),
   ("1.99", non_agile_tariff),
   ("", agile_tariff),
-  ("0", agile_tariff),
   ("-1.0", agile_tariff),
   ("s", agile_tariff),
   ("1.01", agile_tariff),
diff --git a/tests/unit/target_rates/test_calculate_continuous_times.py b/tests/unit/target_rates/test_calculate_continuous_times.py
index e7785ff7..c5936e03 100644
--- a/tests/unit/target_rates/test_calculate_continuous_times.py
+++ b/tests/unit/target_rates/test_calculate_continuous_times.py
@@ -657,4 +657,43 @@ async def test_when_weighting_specified_then_result_is_adjusted(weighting: list,
     assert result[index]["start"] == expected_from
     expected_from = expected_from + timedelta(minutes=30)
     assert result[index]["end"] == expected_from
-    assert result[index]["value_inc_vat"] == expected_rates[index]
\ No newline at end of file
+    assert result[index]["value_inc_vat"] == expected_rates[index]
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("weighting",[
+  (None),
+  ([]),
+])
+async def test_when_target_hours_zero_then_result_is_adjusted(weighting):
+  # Arrange
+  current_date = datetime.strptime("2022-10-22T09:10:00+00:00", "%Y-%m-%dT%H:%M:%S%z")
+  target_start_time = "09:00"
+  target_end_time = "22:00"
+
+  rates = create_rate_data(
+    datetime.strptime("2022-10-22T00:00:00+00:00", "%Y-%m-%dT%H:%M:%S%z"),
+    datetime.strptime("2022-10-23T00:00:00+00:00", "%Y-%m-%dT%H:%M:%S%z"),
+    [19.1, 18.9, 19.1, 15.1, 20]
+  )
+
+  applicable_rates = get_applicable_rates(
+    current_date,
+    target_start_time,
+    target_end_time,
+    rates,
+    True
+  )
+
+  # Act
+  result = calculate_continuous_times(
+    applicable_rates,
+    0,
+    False,
+    False,
+    None,
+    weighting=weighting
+  )
+
+  # Assert
+  assert result is not None
+  assert len(result) == 0
\ No newline at end of file
diff --git a/tests/unit/target_rates/test_create_weighting.py b/tests/unit/target_rates/test_create_weighting.py
index 9987ad73..9293855e 100644
--- a/tests/unit/target_rates/test_create_weighting.py
+++ b/tests/unit/target_rates/test_create_weighting.py
@@ -7,6 +7,7 @@
   (None, 3, [1,1,1]),
   ("", 3, [1,1,1]),
   (" ", 3, [1,1,1]),
+  ("", 0, []),
   ("1", 3, [1]),
   ("1,2,3", 3, [1,2,3]),
   ("2,*,3", 4, [2,1,1,3]),