You could inquire about having more than one person working on your head?. When I was in Ghana, I had a full head of braids with extensions with ends burnt and it was amazing how fast (as well as good) the job was done. Ya can't be too tenderheaded tho' - at one point I had 4 people working on me at once - but it was done a few hours (~3 1/2?) and it was amazing.