in this week, i am playing gambling and i play for dice in one site. and from that game, i can earn for 0.002btc for i think in 7 times to play but after in the 9th games, i loss 0.0015btc and i only make for 0.0005btc, its pretty good day and i think its enough for me because i don't seem to play it anymore, maybe in next week if i have another bitcoin.
With that amount of winning it won't be enough for me to end the day and win 0.0005 bitcoins only, I would set an amount and maybe 0.005 bitcoins for a day. And since you are just playing with dice sites then your winning is very limited but if you are an experience gambler then should be winning 0.005 bitcoins - 0.01 bitcoins depending on your luck.