diff --git a/app.go b/app.go
index 826dba8..a3b0577 100644
--- a/app.go
+++ b/app.go
@@ -3,7 +3,6 @@ package gomeassistant
 import (
 	"context"
 	"fmt"
-	"log"
 	"os"
 	"time"
 
@@ -133,7 +132,7 @@ func getSunriseSunset(a *app, sunrise bool, offset []DurationString) carbon.Carb
 	if len(offset) == 1 {
 		t, err = time.ParseDuration(string(offset[0]))
 		if err != nil {
-			log.Fatalf("Could not parse offset passed to %s: \"%s\"", printString, offset[0])
+			panic(fmt.Sprintf("Could not parse offset passed to %s: \"%s\"", printString, offset[0]))
 		}
 	}
 
diff --git a/entitylistener.go b/entitylistener.go
index ff1f1ae..3c3d281 100644
--- a/entitylistener.go
+++ b/entitylistener.go
@@ -2,10 +2,10 @@ package gomeassistant
 
 import (
 	"encoding/json"
-	"log"
 	"time"
 
 	"github.com/golang-module/carbon"
+	"github.com/saml-dev/gome-assistant/internal"
 )
 
 type EntityListener struct {
@@ -114,23 +114,13 @@ func (b elBuilder3) ToState(s string) elBuilder3 {
 }
 
 func (b elBuilder3) Duration(s DurationString) elBuilder3 {
-	// TODO: test this, should rename duration? not sure if Delay implies that state change cancels the callback
-	// if change name to Duration then enforce being used with ToState, should FromState be allowed?
-	// if FromState set to 3, then state changes to 2 and changes again to 1 halfway through delay, should the
-	// delay reset?
-	d, err := time.ParseDuration(string(s))
-	if err != nil {
-		log.Fatalf("Couldn't parse string duration passed to For(): \"%s\" see https://pkg.go.dev/time#ParseDuration for valid time units", s)
-	}
+	d := internal.ParseDuration(string(s))
 	b.entityListener.delay = d
 	return b
 }
 
 func (b elBuilder3) Throttle(s DurationString) elBuilder3 {
-	d, err := time.ParseDuration(string(s))
-	if err != nil {
-		log.Fatalf("Couldn't parse string duration passed to Throttle(): \"%s\" see https://pkg.go.dev/time#ParseDuration for valid time units", s)
-	}
+	d := internal.ParseDuration(string(s))
 	b.entityListener.throttle = d
 	return b
 }
diff --git a/eventListener.go b/eventListener.go
index 915c515..5821f0d 100644
--- a/eventListener.go
+++ b/eventListener.go
@@ -2,10 +2,10 @@ package gomeassistant
 
 import (
 	"encoding/json"
-	"log"
 	"time"
 
 	"github.com/golang-module/carbon"
+	"github.com/saml-dev/gome-assistant/internal"
 	ws "github.com/saml-dev/gome-assistant/internal/websocket"
 )
 
@@ -72,10 +72,7 @@ func (b eventListenerBuilder3) OnlyBefore(end string) eventListenerBuilder3 {
 }
 
 func (b eventListenerBuilder3) Throttle(s DurationString) eventListenerBuilder3 {
-	d, err := time.ParseDuration(string(s))
-	if err != nil {
-		log.Fatalf("Couldn't parse string duration passed to Throttle(): \"%s\" see https://pkg.go.dev/time#ParseDuration for valid time units", s)
-	}
+	d := internal.ParseDuration(string(s))
 	b.eventListener.throttle = d
 	return b
 }
diff --git a/internal/internal.go b/internal/internal.go
index 0ad2913..92812ea 100644
--- a/internal/internal.go
+++ b/internal/internal.go
@@ -1,6 +1,7 @@
 package internal
 
 import (
+	"fmt"
 	"log"
 	"time"
 
@@ -21,3 +22,11 @@ func ParseTime(s string) carbon.Carbon {
 	}
 	return carbon.Now().StartOfDay().SetHour(t.Hour()).SetMinute(t.Minute())
 }
+
+func ParseDuration(s string) time.Duration {
+	d, err := time.ParseDuration(s)
+	if err != nil {
+		panic(fmt.Sprintf("Couldn't parse string duration: \"%s\" see https://pkg.go.dev/time#ParseDuration for valid time units", s))
+	}
+	return d
+}
diff --git a/schedule.go b/schedule.go
index 45943d8..825bdad 100644
--- a/schedule.go
+++ b/schedule.go
@@ -114,20 +114,14 @@ func (sb scheduleBuilderDaily) Sunset(a *app, offset ...DurationString) schedule
 }
 
 func (sb scheduleBuilderCall) Every(s DurationString) scheduleBuilderCustom {
-	d, err := time.ParseDuration(string(s))
-	if err != nil {
-		log.Fatalf("couldn't parse string duration passed to Every(): \"%s\" see https://pkg.go.dev/time#ParseDuration for valid time units", s)
-	}
+	d := internal.ParseDuration(string(s))
 	sb.schedule.frequency = d
 	return scheduleBuilderCustom(sb)
 }
 
 func (sb scheduleBuilderCustom) Offset(s DurationString) scheduleBuilderEnd {
-	t, err := time.ParseDuration(string(s))
-	if err != nil {
-		log.Fatalf("Couldn't parse string duration passed to Offset(): \"%s\" see https://pkg.go.dev/time#ParseDuration for valid time units", s)
-	}
-	sb.schedule.offset = t
+	d := internal.ParseDuration(string(s))
+	sb.schedule.offset = d
 	return scheduleBuilderEnd(sb)
 }