DD2 cannot last much more than 1hr 20mins awake. Often it is less. She needs about 5-6hrs sleep a day and still sleeps 11-12hrs at night (she does feed in the night!).
DD1 didn't favour much sleep, and so I can't get my head around how much DD2 sleeps. Is she unusual? How will she find the time to learn stuff and develop? How much sleep do your babies of roughly the same age need?