i think you are thinking too much... you are through!!!!!!! and that is the bottomline , stretch it as much as you feel like. and if i was you i would be traveling around and seeing the places i always wanted to (ladakh, sikkim, meghalaya, pondicherry) to name a few.... i can understand your situation since i am an importer and i need my passport all the time in case my consignment is stopped by customs in HKG/taiwan/ china.... and if i dont have it then tough... the goods are lost but like or not... this is part of the deal...
infact i find it rather silly that passport is kept for 2 months... totally avoidable...they can do all the background stuff and then just ask us to turn up with passports when they intend to put the sticker on it... easy peasy!!!