If I have to complete the arena expansion before the next home game i order to build 500 bleachers..it takes 6 days to build them.other opinions are 5-9 LB,200 LT(all these expansions take roughly 5-6 days to complete).....i have never tried to build CS before home game so i dont have much idea how many seats can be built in a week but if we go by some estimates i think 30-45 seats will easily be built in a week...
hope that helped...