OW where you can swim side by side while sharing air.
Why would a dive buddy team "swim side by side" when they are sharing air in an OOA situation??? They are still going to continue the dive looking at fish? If they are going to go up to end the dive and get to the surface, and this is the only thing they should be doing in this scenario, they are going to be going up facing each other and holding on to each other's BC with one hand each while controlling their buoyancy with the other hand. Having a hose that is longer than 39 - 42 inches is a waste of rubber and isn't necessary (for recreational single BM tank setup).