It's awful. It's especially awful at 4am, sterilising baby bottles. So I have to put them in, then wait the 6 minutes before I can go back to bed so it's not beeping every minute for next three hours.
Now, another pet hate. When you're making important phonecalls, and someone says, "I'll phone you back in 30 minutes". That was 75 minutes ago.
Obviously wouldn't care if they just said get back to me by the end of the day, but I'm now in the position that I don't want to do anything that might mean I miss the call, whilst at the same time NEEDING to do something that'll make me miss the call.