They pay out really quick WHEN they reward you the coins but I spent weeks on a challenge worth just under £20 worth of coins, didn't award me the coins. I emailed them, got told to send evidence, sent it immediately then got ignored for 5 days before they just closed my ticket saying I didn't reply. So yeah, WHEN the coins are rewarded, they payout really quick but prepare to waste weeks for them to just ignore your report when you point out their error.