What times? Or is it just whenever you get the opportunity.
Times vary but they are completed roughly 8AM EST, 1PM EST, 7PM EST, 12AM EST.
Is your fee always close to what it is or does it vary based on your needs?
The price that we purchase coins at varies based on volatility, the difference between MtGox and other exchanges, and funds available for payout. PayPal has an additional 1% fee (due to it's high cost for merchants) however many of our other payout methods like ACH or company check have no additional fee. The margin included in the sell price is currently at the high end of the range due to recent price spike and other exchanges lagging behind MtGox.
I just did 45 btc for 4.5% that way.
I am curious how you were able to achieve 4.5% effective fee? Doesn't bitstamp charge a 0.5% trading fee? BitInstant charge a 4% fee on a transfer? wirwox charge a 2% fee on PayPal withdrawals? 0.995 * 0.96 * 0.98 = 6.4% right?