How long does the game last? Like how many seasons. Wanting to run a story based universe and care of that mote than my own character doing well and want to do a realistic type story with fictional characters

There's really no maximum length that the game can proceed for a specific golfer you create. Hopefully the golfer's skills begin atrophing at some point so that he eventually becomes unsuccessful on the pro tour and has to go to the senior tour and then eventually has to "retire". I"ve never taken a golfer very many years along his career though.