A New Record!
Hardly anything surprises me after doing this for so many years but this did it!
Eighty-seven (87) hours on this set of Ashaway Monogut ZX. The player is a highly ranked junior that just finished the College Recruitment Tour that took her from Tallahassee to the New England states during which time she played against others from around the country. While she has 6 racquets in rotation she played exclusively with this one and kept accurate records of hitting hours.
I certainly don’t recommend using any string for 87 hours but I asked her to keep track, and she did!