Personally I found benching twice per week to work out best for me. It's hard to say what I would de exactly because during my competitive days I've always trained all 3 lifts so not sure what my body can handle if I excluded squats and deadlift.
At the end I don't think there's a right or wrong answer to this and will vary by lifter. I use to train with an extremely elite bencher that would only bench one day per week and do high volume on that day. He had 2 shot shoulders and was in his high 40s at the time. Benching one day per week and including board presses as his first movement helped keep his shoulders healthy and body fully recovered. If I remember correctly he did a basic progressive overload. I believe this was his training when I trained with him prepping for a meet.
-2 Board Press: work up to top set of 3x5 reps
-Touch-n-go bench press: 2x5 reps (20 pounds less than board press)
-Pause bench press: 2x5 reps (20 pounds less than touch-n-go bench)
-Flat Dumbbell Bench: 3x 5-10 reps somewhere
-Smith Machine Floor Press: 3x 5-10 reps
-Lateral shoulder raises
I believe he started somewhere in the 70-75% range and progressed upward. As he got closer his reps decreased, but sets remained the same. I think maybe a few weeks out the sets dropped and maybe a few assistance work dropped. He also went up to 3 board press as well. That was basically it. He was the first guy I ever seen in-person that could rep 405 on the bench easily at 165 pounds. The last day I worked out with him he did an easy 435x2 touch-n-go, the week after that he put on his bench shirt. I was a pretty good bencher at my prime and was in the same weight class as him, but he made me look like a child. He's a multi-IPF worlds gold medalist. I think he was dominating the mens open class for a while until guys like Daiki Kodama (from Japan) and Marcus Shick (Germany?) came into the scene. Back then Joe Mazza was dominating outside the IPF, who I believe is the first (non-disabled) 165er to bench 500 @ 165 raw in a meet and beating Rick Weils infamous 485 @ 165 raw record (although his was done in a 3-lift meet) that standed for over 25 years, although his 551 @ 181 raw record has yet to be touched.
Sorry I went off on a historical tangent, but back then I loved powerlifting with a passion. Miss those days...
