They are always longer.
I went to a Microsoft developers convention this year. The men's rooms had the lines, the women could just walk in. But IT is a kind of anti-universe.
A few years ago I was at a missions conference for college students where they tried to alleviate that. Half the mens rooms at the main hall (Assembly Hall on the U of Illinois campus) were used as ladies rooms during the longer evening sessions. The remaining mens rooms had worse lines than the ladies rooms next to them.