diff --git a/src/api/energyAssistant.api.ts b/src/api/energyAssistant.api.ts
index e111876..0f8a894 100644
--- a/src/api/energyAssistant.api.ts
+++ b/src/api/energyAssistant.api.ts
@@ -222,10 +222,10 @@ export class EnergyAssistantApi {
     return (await this.axiosInstance.get<IForecast>('forecast')).data;
   }
 
-  public async createModel() {
+  public async createModel(daysToRetreive: number) {
     if (!this.axiosInstance) throw 'not initialized';
     return await this.axiosInstance.post<ICreateForecastModel>(
-      'forecast/create_model',
+      'forecast/create_model?days_to_retrieve=' + daysToRetreive,
     );
   }
 
diff --git a/src/translations/de.json b/src/translations/de.json
index 06c3486..edcfb39 100644
--- a/src/translations/de.json
+++ b/src/translations/de.json
@@ -70,12 +70,15 @@
     "forecast": "Vorhersage",
     "core": "Energy Assistant",
     "forecast_create_model": "Vorhersagemodell erzeugen",
-    "forecast_create_model_text": "Erzuege das Vorhersagemodell für den Energieverbrauch basierend auf den historischen Daten aus Homeassistant.",
+    "forecast_create_model_text": "Erzeuge das Vorhersagemodell für den Energieverbrauch basierend auf den historischen Daten aus Homeassistant.",
     "forecast_create": "Erzeugen",
     "forecast_tune_model": "Vorhersagemodell optimieren",
     "forecast_tune_model_text": "Optimiere das Vorhersagemodell. Dieser Vorgang kann einige Zeit dauern.",
     "forecast_tune": "Optimieren",
     "forecast_r2score": "Der R2 Wert des Modells ist",
-    "delete_action": "Löschen"
+    "delete_action": "Löschen",
+    "forecast_create_model_error": "Das Model konnte nicht erstellt werden. Homeassistant hat wahrscheinlich nicht genügend Daten.",
+    "forecast_value_too_small": "Der Wert ist zu klein.",
+    "forecast_field_required": "Bitte einen Wert eingeben."
   }
 }
diff --git a/src/translations/en.json b/src/translations/en.json
index b1c1a6a..a14fde7 100644
--- a/src/translations/en.json
+++ b/src/translations/en.json
@@ -73,9 +73,12 @@
     "forecast_create_model_text": "Create the load forcast model based on historical data.",
     "forecast_create": "Create",
     "forecast_tune_model": "Tune forecast model",
-    "forecast_tune_model_text": "      Tune the load forcast model in order to optimize the forecast quality.  This might take some time.",
+    "forecast_tune_model_text": "Tune the load forcast model in order to optimize the forecast quality.  This might take some time.",
     "forecast_tune": "Tune",
     "forecast_r2score": "Model R2 score is",
-    "delete_action": "Delete"
+    "delete_action": "Delete",
+    "forecast_create_model_error": "Failed to create the model. Homeassistant might not have enough data.",
+    "forecast_value_too_small": "The value is too small.",
+    "forecast_field_required": "Field is required"
   }
 }
diff --git a/src/views/settings/Forecast.vue b/src/views/settings/Forecast.vue
index 4301363..7e90200 100644
--- a/src/views/settings/Forecast.vue
+++ b/src/views/settings/Forecast.vue
@@ -2,7 +2,16 @@
   <v-card class="m-4 max-w-sm elevation-6">
     <v-card-title>{{ $t('settings.forecast_create_model') }}</v-card-title>
     <v-card-item>
-      {{ $t('settings.forecast_create_model_text') }}
+      <div class="my-2">
+        {{ $t('settings.forecast_create_model_text') }}
+      </div>
+      <v-text-field
+        v-model="numberOfDays"
+        label="Anzahl Tage"
+        single-line
+        type="number"
+        :rules="dayRules"
+      />
       <v-progress-linear
         v-if="isCreating"
         indeterminate
@@ -49,16 +58,27 @@ const { t } = useI18n();
 const isCreating = ref(false);
 const isTuning = ref(false);
 const r2Label = ref('');
+const numberOfDays = ref(10);
 
 const CreateModel = async function () {
   isCreating.value = true;
-  const response = await api.createModel();
-  isCreating.value = false;
-  r2Label.value =
-    t('settings.forecast_r2score') + ' ' + response.data.r2.toFixed(2);
+  try {
+    const response = await api.createModel(numberOfDays.value);
+    r2Label.value =
+      t('settings.forecast_r2score') + ' ' + response.data.r2.toFixed(2);
+  } catch (error) {
+    r2Label.value = t('settings.forecast_create_model_error');
+  } finally {
+    isCreating.value = false;
+  }
 };
 
-const TuneModel = async function () {
+const dayRules = [
+  (value) => !!value || t("settings.forecast_field_required"),
+  (value) => (!!value && value > 2) || t("settings.forecast_value_too_small"),
+];
+
+const TuneModel = async () => {
   isTuning.value = true;
   await api.tuneModel();
   isTuning.value = false;