Way under a second for anything. The transitions (not animations as you put) are there to show where something has moved to as well as hide some latency. Check the metro guidelines that Microsoft published around using transitions.

This is the great irony of Android. Not only do many iOS users never use it (and thus when they think Android, they think Froyo or even Gingerbread). That, and they're so used to their iPhone that is the standard. Even when I can do things just as intuitively or easily.