I train chest 8 times a week.
Here is my routine:
mon: chest, (rest 6 hours) then 2nd session of chest
tues: back, chest
wed: cardio, chest
thurs: shoulders, chest
fri: legs, chest
sat: cardio, chest
sun: 1/2 day rest, chest
I also do about 30 sets of chest on each day. I always employ preexhaust, supersets, dropsets, and giant sets. I know my limit though. When I have a flu, I cut it back to 25 sets and don't employ super sets or giant sets. I do however make up for the smaller volume by upping my caffeine amount from 500mg to about 2500mg.