the first 5 are 5 minute sketches.
the next 2 are 10 minute sketches.
there is one 20 minute and a 30 minute.
the last one everyone decided they wanted an hour pose. i personally felt that, for what i want to do, 1 hour is to long, so i dedicated about 40 of the minutes to make sure i do a real top quality pencil rendering. after that i try something different and used a blue brush pen. it didn't turn out great but it was different.