diff --git a/README.md b/README.md
index fadad68..c7bec26 100644
--- a/README.md
+++ b/README.md
@@ -154,6 +154,7 @@ NOTIFY_SLACK_CHANNEL
 NOTIFY_SLACK_SNIPPET_CHANNEL
 NOTIFY_SLACK_USERNAME
 NOTIFY_SLACK_ICON_EMOJI
+NOTIFY_SLACK_INTERVAL
 ```
 
 It will be useful if you want to use it on a container. If you use it, you don't need a configuration file anymore.
diff --git a/config/config.go b/config/config.go
index b7178eb..3fc137f 100644
--- a/config/config.go
+++ b/config/config.go
@@ -54,6 +54,15 @@ func (c *Config) LoadEnv() error {
 		c.IconEmoji = os.Getenv("NOTIFY_SLACK_ICON_EMOJI")
 	}
 
+	durationStr := os.Getenv("NOTIFY_SLACK_INTERVAL")
+	if durationStr != "" {
+		duration, err := time.ParseDuration(durationStr)
+		if err != nil {
+			return fmt.Errorf("incorrect value to inteval option from NOTIFY_SLACK_INTERVAL: %s: %w", durationStr, err)
+		}
+		c.Duration = duration
+	}
+
 	return nil
 }
 
diff --git a/config/config_test.go b/config/config_test.go
index 3de823b..1f4a697 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -60,6 +60,8 @@ func TestLoadEnv(t *testing.T) {
 	expectedSnippetChannel := "#general"
 	expectedUsername := "deploy!"
 	expectedIconEmoji := ":rocket:"
+	expectedIntervalStr := "2s"
+	expectedInterval := time.Duration(2 * time.Second)
 
 	reset1 := setTestEnv("NOTIFY_SLACK_WEBHOOK_URL", expectedSlackURL)
 	reset2 := setTestEnv("NOTIFY_SLACK_TOKEN", expectedToken)
@@ -67,15 +69,20 @@ func TestLoadEnv(t *testing.T) {
 	reset4 := setTestEnv("NOTIFY_SLACK_SNIPPET_CHANNEL", expectedSnippetChannel)
 	reset5 := setTestEnv("NOTIFY_SLACK_USERNAME", expectedUsername)
 	reset6 := setTestEnv("NOTIFY_SLACK_ICON_EMOJI", expectedIconEmoji)
+	reset7 := setTestEnv("NOTIFY_SLACK_INTERVAL", expectedIntervalStr)
 	defer reset1()
 	defer reset2()
 	defer reset3()
 	defer reset4()
 	defer reset5()
 	defer reset6()
+	defer reset7()
 
 	c := NewConfig()
-	c.LoadEnv()
+	err := c.LoadEnv()
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	if c.SlackURL != expectedSlackURL {
 		t.Errorf("got %s, want %s", c.SlackURL, expectedSlackURL)
@@ -100,6 +107,10 @@ func TestLoadEnv(t *testing.T) {
 	if c.IconEmoji != expectedIconEmoji {
 		t.Errorf("got %s, want %s", c.IconEmoji, expectedIconEmoji)
 	}
+
+	if c.Duration != expectedInterval {
+		t.Errorf("got %+v, want %+v", c.Duration, expectedInterval)
+	}
 }
 
 func TestLoadTOMLFilename(t *testing.T) {