I've seen 6000 graft FUT cases from Hasson + Wong with lesser coverage than these "3700 grafts", but the largest extraction for a single FUE procedure usually maxes out at around 5000, so probably around that figure.

More than a little questionable that 3700 FUE can look better in only 8 months than a similar balding area FUT case at over 6000 grafts. Joe Tillman has had over 10000 FUT and doesn't look substantially better than this,