diff --git a/lib/content/mixin.js b/lib/content/mixin.js
index 2b1c24d58..ef803e19e 100644
--- a/lib/content/mixin.js
+++ b/lib/content/mixin.js
@@ -130,8 +130,28 @@ export default {
       type: Boolean,
       default: false,
     },
+    timeSpent: {
+      type: Number,
+      default: 0,
+    },
+    duration: {
+      type: Number,
+      default: null,
+    },
   },
   computed: {
+    // For when we want to force a renderer to use time-based progress (e.g. instead of % completed)
+    forceDurationBasedProgress() {
+      return this.options.force_duration_based_progress || false;
+    },
+    // Uses clock-time to track time so that all content types can be tracked the same way
+    durationBasedProgress() {
+      const duration = this.duration || this.defaultDuration;
+      if (!duration) {
+        return null;
+      }
+      return this.timeSpent / duration;
+    },
     defaultItemPreset() {
       return this.defaultFile
         ? this.defaultFile.preset