diff --git a/index.html b/index.html
index b55d506..23f1d63 100644
--- a/index.html
+++ b/index.html
@@ -46,7 +46,7 @@
         <td><input v-model="config.duration" id="duration" type="range" min="5" v-bind:max="totalDuration" step="5" />
         </td>
         <td>
-          <span v-if="(totalDuration / config.duration) < candidates.length" title="slot duration might be too big">
+          <span v-if="slotTooBig" title="slot duration might be too big">
             <i icon="triangle-alert"></i> {{config.duration}} minutes
           </span>
           <span v-else>
diff --git a/main.js b/main.js
index 1c89663..d31c55d 100644
--- a/main.js
+++ b/main.js
@@ -262,6 +262,15 @@ const app = createApp({
             value.length && array.indexOf(value) === index
         );
     },
+    slotTooBig() {
+      const slotCount = this.totalDuration / this.config.duration;
+
+      if (this.config.endWithAll) {
+        return slotCount - 1 < this.candidates.length;
+      }
+
+      return slotCount < this.candidates.length;
+    },
   },
   watch: {
     vegetable() {