How many confirmations does it take for deposit to show up?
none, 0
Can you place a bet right away tho? Or you have to wait for at least one confirmation?
I've been able to place bets without any confirmations up until now. It says not enough balance even tho my balance is more than 1 mBTC
Yeah you can, confirmations are only needed for withdrawals. If it says not enough balance you need to lower your bet to 0.98 or 0.99 mbtc there might be a visual bug under sportsbet systems or they just estimate our balances to avoid having many decimal numbers. I've experienced the same thing where i'll bet all my balance but the system won't let me because it'll say not enough too.