You don't have to race 133 races. Win 12 or 13 first races in a season and you will have an opportunity to sign new contract for another season. Sign it, then simulate practice/qualification sessions and disqualify yourself in races for rest of a season (it only takes 5 min or so for a race weekend). You can also "simulate" entire 7th season as it is last season and you don't have to sign another contract. This way you can cut the number of races you have to actually race to nice 78, maybe less.