no time limit I think.
usually those girl don't enjoy doing, I will try to concentrate cum
faster, some girls really do eat as if they are eating ice cream
then I will look around or watch TV to drug the time.
I think is the girl that control timming, if they just lick and
don't suck you will know they enjoy it, if they are trying hard
moving their head you better cum fast, else they stop you get
nothing. 
