Is leaving proraso on for five minutes instead of three anymore beneficial? Why would three minutes be optimum instead of five?
First, welcome. Every face is different. Only your face can tell you what works best for it. Try different times; listen to your face. And for what it's worth, I've never let lather, be it from soap or cream, marinate my face. But that's me.
I don't time how long the soap stays on. Warm shower, warm face rinse, warm brush, and face lather. Never had an issue.
Imho unless your whiskers are literal steel wool, it will make very little difference how long you leave product on your face before shaving. But, feel free to experiment to find out what's best for you.
If he's on the west side of town in Mexico Beach, FL, he can lather up, go across town, and say he's let that lather sit for an hour!
I once was so enamored with the scent of Tabula Rasa Steam Punk, I left the lather on my face and watched some TV. Bad idea...just saying.