My DD hated tummy time but then she hated any time that she wasn't attached to me in the Ergo so for the first 3 months of her life she basically lived in it hehe. We did do tummy time but it would last a cpl mins and that's it. I say just pick her up when she has had enough. When she is on the floor get down on your tummy too so that she can see you're there. I used to lie her tummy on my breast feeding pillow and she seemed to enjoy that more.