How many aircraft can airline put in hangar? Another question talks about aircraft movement in and out of hangar.  Most hangar I see at commercial airport I see one aircraft per hangar. 

This makes me wonder how many aircraft can be kept in the hangar depth-wise(ie nose-to-tail direction)? Is larger hangar common? 

Note: please do not include special hangars such as those at Airbus or Boeing facility in main answer but side note about those are welcomed.
There are no restrictions. You can put as many aircraft into a hangar as you can fit into it. 

Some commercial hangars are neatly arranged.



Some are not as neatly arranged but efficiently packed.



And sailplanes can be lifted and hung from the ceiling for more space on the ground.