movdqa
Talk Tennis Guru
4 is a lot? I never thought so, I don’t play full poly (past injury) and have broken multiple strings during a tournament week. I have switched from multi/poly to gut/poly and that has helped.
I think that it varies widely between players. String type, gauge, game style (flat vs spin), frequency of play and your stringing resources. If you can string it yourself, then fewer racquets. If you have to drive an hour to get them strung, then maybe more racquets. I find that four is pretty convenient for the long haul but can be quite a lot of money if you change racquets every year.