So my question is - How much winning is enough for you in a day. You're answer should be based on your capital not on your multiplier. Also how much is it for losing?
The answers to this question have always been the same. Gamblers have different affinities for gambling, which is why it has always been low, medium and high wagering appetite depending on many factors such as the gambler's income, desperation/recklessness, goal, discipline etc. Above all, it's better for gamblers to keep it low or moderate, and most importantly work on their managerial skills which keep their account safe and their trading style responsible.
I don't see myself having a bankroll of $100 and wagering higher than $5 per bet.