In terms of resting and healing from the wear and tear of the season, just how much does a bye help really?

(To be clear, this is NOT a "the bye is bad/the bye hurts teams" post.)

The bye definitely helps in setting up your rotation, however what I question is just how much it can help with recovering and resting from the long wear and tear of a 162 game season. If the bye is only like 3 or 4 extra days of rest, then does it make a big difference? For example, Shohei Ohtani is getting some reps before the playoffs, just how much will the time off from the bye help with injuries usually?