egg timer
Used in reference to a person who you can only deal with for a short amount of time before you want to run away and/or hurt them
"She was a serious egg timer. A couple of minutes and I wanted to just punch her in the face."
Egg Timer
Someone who talks for a rather long discriminate amount of time when a conversation is started, no matter how.
Angela is an absolute egg timer. Can't just have a minute conversation with that woman.