You can see your GH/s working under mining history tab. Perhaps it will take 2-3 hrs but not more.
Does it take 2 or 3 hours to "turn on" GHS or is it just the time for hashing power to come up on the site?
Another thing I dont quite understand is the payouts from block. WIth cex the payout from block was +/- constant but with kryptologika it varies from block to block even for as much as 200%. Could you please explain the mechanic behind this?