How long doea a WW leap last?

Like what Gigi mentioned, the duration is dependent on which leap your baby is going through. So a quick reference, you can refer to the table in this article: http://www.babysleepsite.com/baby-sleep-patterns/wonder-weeks-chart-baby-toddler-sleep/ A short description and the approximate duration for each leap is noted in the table. Hope this helps!

It depends on how many weeks your baby is at.... (according to EDD not birthdate). The app will tell you how long.