1) how good the finished product sounds
2) how much fun you had getting there
If it were me, Id do as many takes as possible all the way through as you can pick the best and edit down the material later.
If you are pushed for time, then just record a loop.
My instructors page and www.studiotrax.net for all things recording.
my toons Brought to you by Dr BadGAS
my toons Brought to you by Dr BadGAS