250$US, i was a very short-attention span kinda guy when i started playing and really only ever bought in for like 25 or 50 each time i played . but i would buy in countless times trying to win big.
eventually i the time out of my day and made up some income records and started looking into budgeting my money online.

i found it much better to buy in for around 100+ and join sites with bonuse offers for extra cash, learn to grind limit and only move up when you feel confident

id say anything over a 500$ loss should show you need to improve your game to get the results