Don't forget that flydubai does prefer NOT to nightstop it's crew. So it has to be possible as a there-and-back. The current Eastern European routes are pushing the FTL as it is. And that's with a double crew! Prague is doing well so who knows what that signals to management... They frequency is already being raised.
flydubai is short of crew and aircraft. I'm guessing we'll see big changes when the expansion goes into overdrive from May16 onwards. Not to mention the MAX8 introduction in Q3 2017.