Celebrity gambling losses?

i'll try to keep this as simple as possible. what is a realistic amount of money that could be lost by a celebrity gambling in vegas for one weekend? this person is not a professional/ habitual gambler. say they were just having a bad night. what would be a shock value amount of money for them to lose? i've never gambled in vegas. not even sure how much money you can blow. this is for a story i'm writing.