a) only after the transaction is confirmed, which takes an average of 10 minutes.
b) we don’t support withdrawals. There’s no need to withdraw your tokens if you imported them correctly and didn’t transfer ANY of them out or otherwise use them in any way. For example: If you put $200 worth of ICON into your account, then sold $200 worth of ICON at $0.0005 (~$1/100), it could look like you’re withdrawing that $1000+ but in reality its just a small withdrawal fee that was processed by Binance themselves (since they can decide how much money goes towards fees and what doesn’t). So if you do this, we will not be able to give you the @50% remainder to make up for the 200×10′ amount mentioned above (leaving ~$904/$929).