3% fee as far as I know but I'm pretty sure that is already paid as soon as you get the coins so you will get paid out the full 15BTC. Don't quote me on that last point though.
You're correct sir, fees are deducted as soon as your deepbit account is credited with the previous block's earnings, so what you see for your balance is post-fees. I have mine set to 1BTC instant payout, and I get exactly 1.00 BTC transferred to my wallet.
cent
How long on average has it been taking to see it in your wallet?
30 seconds, if that. Of course, it shows up unconfirmed and took a while to get confirmations and my balance to reflect the deposit. But the transaction itself should show up almost immediately.
I'm going on 24 hrs to get a payment from slush..... Received one before that took nowhere near as long.
let's not be hasty here, there are variables that affect this, "usually" around 30 seconds, but sometimes it'll take longer...