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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <title>Videos</title>
+  </head>
+  <body>
+    <ul class="videos">
+      <li data-time="5:43">
+        Video 1
+      </li>
+      <li data-time="2:33">
+        Video 2
+      </li>
+      <li data-time="3:45">
+        Video 3
+      </li>
+      <li data-time="0:47">
+        Video 4
+      </li>
+      <li data-time="5:21">
+        Video 5
+      </li>
+      <li data-time="6:56">
+        Video 6
+      </li>
+      <li data-time="3:46">
+        Video 7
+      </li>
+      <li data-time="5:25">
+        Video 8
+      </li>
+      <li data-time="3:14">
+        Video 9
+      </li>
+      <li data-time="3:31">
+        Video 10
+      </li>
+      <li data-time="5:59">
+        Video 11
+      </li>
+      <li data-time="3:07">
+        Video 12
+      </li>
+      <li data-time="11:29">
+        Video 13
+      </li>
+      <li data-time="8:57">
+        Video 14
+      </li>
+      <li data-time="5:49">
+        Video 15
+      </li>
+      <li data-time="5:52">
+        Video 16
+      </li>
+      <li data-time="5:50">
+        Video 17
+      </li>
+      <li data-time="9:13">
+        Video 18
+      </li>
+      <li data-time="11:51">
+        Video 19
+      </li>
+      <li data-time="7:58">
+        Video 20
+      </li>
+      <li data-time="4:40">
+        Video 21
+      </li>
+      <li data-time="4:45">
+        Video 22
+      </li>
+      <li data-time="6:46">
+        Video 23
+      </li>
+      <li data-time="7:24">
+        Video 24
+      </li>
+      <li data-time="7:12">
+        Video 25
+      </li>
+      <li data-time="5:23">
+        Video 26
+      </li>
+      <li data-time="3:34">
+        Video 27
+      </li>
+      <li data-time="8:22">
+        Video 28
+      </li>
+      <li data-time="5:17">
+        Video 29
+      </li>
+      <li data-time="3:10">
+        Video 30
+      </li>
+      <li data-time="4:43">
+        Video 31
+      </li>
+      <li data-time="19:43">
+        Video 32
+      </li>
+      <li data-time="0:47">
+        Video 33
+      </li>
+      <li data-time="0:47">
+        Video 34
+      </li>
+      <li data-time="3:14">
+        Video 35
+      </li>
+      <li data-time="3:59">
+        Video 36
+      </li>
+      <li data-time="2:43">
+        Video 37
+      </li>
+      <li data-time="4:17">
+        Video 38
+      </li>
+      <li data-time="6:56">
+        Video 39
+      </li>
+      <li data-time="3:05">
+        Video 40
+      </li>
+      <li data-time="2:06">
+        Video 41
+      </li>
+      <li data-time="1:59">
+        Video 42
+      </li>
+      <li data-time="1:49">
+        Video 43
+      </li>
+      <li data-time="3:36">
+        Video 44
+      </li>
+      <li data-time="7:10">
+        Video 45
+      </li>
+      <li data-time="3:44">
+        Video 46
+      </li>
+      <li data-time="3:44">
+        Video 47
+      </li>
+      <li data-time="4:36">
+        Video 48
+      </li>
+      <li data-time="3:16">
+        Video 49
+      </li>
+      <li data-time="1:10">
+        Video 50
+      </li>
+      <li data-time="6:10">
+        Video 51
+      </li>
+      <li data-time="2:14">
+        Video 52
+      </li>
+      <li data-time="3:44">
+        Video 53
+      </li>
+      <li data-time="5:05">
+        Video 54
+      </li>
+      <li data-time="6:03">
+        Video 55
+      </li>
+      <li data-time="12:39">
+        Video 56
+      </li>
+      <li data-time="1:56">
+        Video 57
+      </li>
+      <li data-time="4:04">
+        Video 58
+      </li>
+    </ul>
+    <script>
+      const timeNodes = Array.from(document.querySelectorAll("[data-time]"));
+
+      const allSeconds = timeNodes
+        .map((node) => node.dataset.time)
+        .map((timeCode) => {
+          const [mins, secs] = timeCode.split(":").map(parseFloat);
+
+          return mins * 60 + secs;
+        })
+        .reduce((total, vidSeconds) => {
+          return total + vidSeconds;
+        });
+
+      let secondsLeft = allSeconds;
+      const hours = Math.floor(allSeconds / 3600);
+      secondsLeft %= 3600;
+
+      const mins = Math.floor(secondsLeft / 60);
+      secondsLeft %= 60;
+
+      const seconds = secondsLeft;
+
+      console.log(hours, mins, seconds);
+    </script>
+  </body>
+</html>
