Im not too sure - that does seem like alot!!! I didn't get AF for 7 months as i was exclusively b/f then too - and the month AF returned was an absolute shocker. I'm usually a really heavy bleeder but that month was horrific, even really clotty (sorry - TMI) and it did go longer than usual...maybe about 1 1/2 weeks. It has fortunately calmed down heaps since then. If u r getting really concerned maybe just check it out with ur GP. Good luck with it!