5
Maybe too many but they all get ridden on a regular basis
commuter - 83 Schwinn Passage converted to fixie with moustache bar, fenders, rack and lights - used most days for commuting
"track" bike - 05 Mercier Kilo TT, added a front brake and bull horn bars - used in nice weather for commuting and short recreational rides
MTB - Pugsley, single speed ultra fat tire bike - off-road riding and snow commuting
recumbent - Bacchetta Strada, fast comfortable laid back bike - long recreational rides and centuries
tandem - Fuji Shangri-La for Two, cruiser tandem - family rides around the neighborhood with wife and daughter in tow on trailer.
I think every bike got used at least 20-30 times last year. Everything except the tandem and MTB saw over 1000 miles. Some of the bikes didn't see heavy usage but none were idle. I know of alot of single bike owners who used their bike lot less.
Craig

Craig