Yes, privacy issues can certainly play havoc on a hanging routine. If you haven’t hanged in 6 months I would imagine 1 hour will be just fine for now. Hanging 20 lbs. after a long break sounds a bit much to me, but if that is what it is taking you to feel fatigue,then great.
How long would it take to get an inch?
That would depend on so many variables I couldn’t even give a good guess. My advice to you would be just to do what you can,get fatigued and keep it every day. Have you thought about using an ADS? If my hanging time had to go down, I would try one. Good luck, I’m sorry I can’t answer your question,gains vary for each individual. If you want an inch,go get it,that is all I know.
Alice