There's really no end in sight for Bleach yet, 2 years minimum I would say, conservative guess, considering it's pace might be even longer. Fairy Tail's arcs all were over pretty quick, mmmhhh not so sure about that one, seeing how all major battle were 3 chapters long tops. MMhhh, maybe 2 month? 

of course it has potential to go on forever. there could have been a built up of the 12 in OP dimensions, all of them having couple of generals, making an entire arc of each. but how likely is that gonna happen. (two months was a joke btw, yay e-humor! BUT)
