Hi Shampoo,
I replied without noticing the size of FUE procedure you were referring to. 2700 grafts by fue is a big procedure and would certainly require a lengthy amount of 'face down' time.
To give you an idea, I myself underwent a 2000 graft fue procedure with Dr. Lorenzo when he worked alongside us in 2013. The extraction time was probably around five hours and I was face down for around half of that time.
Pete