I was at a hotel once and went to the bathroom while heating up some food. The microwave finished and beeped like 10 times then beeped every 15 seconds until I opened the door. I don't really understand what problem that's meant to fix, it's not like the microwave keeps microwaving after it beeps and shuts off, nothing's going to catch on fire
My drier at home does this too, although every 10 minutes as opposed to seconds, and I don't understand that either. Washing machine I could understand since if you forget about it for too long it might go mildew-y, but once my drier is done, it's done, and won't turn back on until Its turned back on. A beep every 10 mins might be nice as an optional toggle or something for forgetful people, but it's just plain annoying
If you time it just right and open the door after the numbers disappear but before the beepy-beeps, you might just experience the greatest joy known to man, on par with witnessing the logo hit the corner of screen.
(Note: frequencies this low could cause discomfort or even damage to your ears, make sure your volume is at an appropriate level before hitting play, especially if you have headphones in)
Mine does some, then waits, then does some again, until you open it. Terrible because there’s enough silence to ignore it, but the beeps are still often enough to be annoying, so your stuck in a constant indecision between getting up and opening the door, and just staying and working since it’s quiet now.