As far as I can tell (and the devs have now blocked me from their twitter feed).
I mined 340,000 Qiwicoins, then waited for the exchange - they ended up making their own exchange (which I guess is ok) and I deposited a bunch of my coins into there - sold 1.24 btc worth and withdraw it.
Took 4 days, then the order was reset - rinse and repeat 3 times.

Then I log in and I have to give my Drivers Licence, Social Security number and Passport info to withdraw.

This coin is a Russian scam, keep clear. They are trying to "mine" personal details from people.   

If the devs want to dispute this, let them... So far they have ignored all users

as a side note, I have never recieved any answers from the admins of Qiwicoin or 7-50.com as to why I cannot withdraw the coins I deposited...