Have you ever put something in the oven, only to get distracted and end up overcooking it?
I used to do it all the time — especially once I started my business. In the oven went dinner, then I was off to check emails or write.
An hour later there was a burning smell (and "yes", baking potatoes CAN explode in your oven!).
Then I discovered the freedom that a simple timer could bring. Set it, off to do whatever and come back when it beeps.
I employ the same principle in my business using a Polder Digital Timer (it's the visual of digital "sand" that makes this far and above other timers):