I believe these are all 30 seconds...
And these range from a minute to 5 minutes.
Part of why I love figure drawing is because it breaks the artist down. No details, it keeps you loose and most of all there is no time for love. Sometimes I get lucky and capture a pose and maybe some unconventional proportions that I like, which I'll try to replicate in a later drawing. I think it's safe to say your own drawings make for good reference....sometimes =]