I've laid down most of the body in one long painting session. Actually a morning and afternoon in the studio with lunch and a nap in between. I paint much better when I'm rested.
Some of the half-tone areas will need more work, but by getting everything down at once I've kept some of the painting-from-life feel that I set out to achieve.
I found a couple of drawing mistakes while working on the body (chest outline and position of the blaze) and I was able to correct them fairly easily.