Not to much compared to you, maybe around $100.
In my case it's not an one session, but it's one bet because I want to try "go big or go home", unfortunately the result is go home and I feel so bad at that time. I think each gambler had suffer a big lose at least once time in his whole life.
This is something that it has happened to almost every gambler out there, since it is very easy to lose control of yourself during a few moments and then make a big bet that you later regret, however for the majority of those gamblers those are isolated incidents, as they realize the mistake they made and they regret their actions, so the next time they are in a similar situation they will remember what they felt after losing so much money and avoid gambling under those conditions.