I’m not really the person to ask when it comes to firsthand experience, but the longer the load hangs out the chute, the more it becomes desiccated, dense, and immotile.
I was on oxycodone after surgery for 5 days, and I took senna (a stool softener) just like my surgeon told me to. Oh my god the constipation was insane. Like, I had to poop and just nothing would come out. I could not move my bowels. I ended up taking Miralax twice a day for 4 days and that solved the problem...a little too well. It went from completely stopped up to faucet anus with no stop in between.