I know the feeling also..........but 10 weeks isnt alot of time you have to go pretty hard core, its took me 1 year to lose 30lbs
Admittedly i probably could have lost faster if my dedication and diet was tighter but its not always possible 100% of the time.
My advice would be dont put a number on it, go for it but dont be disheartened if you dont reach 30lbs any loss is good ....but the tape measure and photos tell the real story so get snapping

GOOD LUCK