6 days or if I really can't 5 as bear minimum, he normally gets mondays off as will have had plenty of time to ride or may have been to show over the weekend.
I ride when I can which is very weather dependent as I only have paddock to ride in and I dont hack! So obviously when the fields are muddy or sun-baked solid I cant get much done! Same with if its super windy I wont ride (I dont have a death wish).
Mine always get a day off after an event though and sometimes before it as well so they are fresher.