[Callers] Estimating space and couples

[Leslie Gotfrit]

I am a new caller trying to log calling hours by hosting kitchen contra parties 
(with live music, beer and food). Could anyone tell me how many linear feet I 
need per couple? My friends' home is about 24 feet on the diagonal: how many 
couple in a longways can I (safely) accommodate?  And what's the minimum number 
of couples in a contra line so that is still fun? Thanks for any advice.