why would you have to change the direction the paper is hung.
Without seeing the lay out I would hang the paper length ways from the door entrance where the main light is on opening the door, then the joins would not be so visible,
I would centralise the first length to run the middle of the hall, (Middle of paper to middle of hall) lining paper width about 60 cm leaving strip either side approximately 20cm, then the joins should not be noticable when finished
@Bosswhite
I think, by right angled hallway, the OP means it is 'L' shaped. This would mean you would have a couple of full lengths on one section and several shorter lengths on the other - but all pieces would be running in the same direction.
I'm with you on running the full lengths along the ceiling from the entrance, but would probably try to get away with just two lengths so there is only one joint in the centre, minimising the chance of noticeable joints. This should be possible if the ceiling is no more than 1m wide, unless there is a pattern match which would make it look uneven.
On the other hand, two joints, as you state, may actually be a better option because the joints wouldn't be so central.
On the third hand (Yes, I'm a circus freak!), I suppose that the light running down the hallway could highlight one or two long joints more than it would several shorter joints running across the ceiling - kind of like if you look at a wall side on and you can't see joints that may be visible from viewing head on.
Either way, if the job is done well, joints shouldn't really be noticeable at all.
Hmm, the more I think about it, the more I think I prefer that third hand option, although actually seeing the layout would be the best way to figure it out.
@ricky101
No need to thank me for my decisiveness in making the decision decidedly easy for you to decide upon.