Brother
@kriskros knows exactly what's to be expected. 1 day off is more than enough. Like I mentioned earlier, 1 day off is actually more than 24 hours off since your last routine. You don't want your tissues to be too cooled or too relaxed after the routine.
Your cells started to regenerate and repair roughly a second or so after you start damaging it. In reality, from the moment the cell is damaged to repair, the latest is 4 hours. Duplication processes start around 6 to 8 hours, and in 24 hours, new cells are formed.
So, let say you performed PE routine yesterday around 6PM for two to three days in a row. You wrapped up and remained elongated. Technically, you're ready to go again 6PM today. BUT, during a day rest, yesterday's 6PM to today's 6PM is 24 hours. Tomorrow's 6PM is considered as 48 hours. That's already a very longer period of rest time.
1 day on, 1 day off, that's practically 48 hours of rest time for too little work. I can understand if you just start on the PE journey in the first two months, but as you progress into the third month and on, you have to be on the routine for two to three days in a row before taking that day off.
Of course, this is your choice. You will not see a dramatic increase in gains, but some gains along the way.