I've just come across this. Very late answer.

If you wanted more answers, you could perhaps come and post in
sexual-disorder/ Which is a good place for random sex questions.
My non scientific opinion. Noting I don't have a penis of my own. But anyway for what it's worth. I think twice a day is completely fine. Especially after a long drought. Porn is also completely fine in moderation. Just watch out for it becoming compulsive. "I have to wank because it's 7pm. I
always masturbate before bed / in the shower." And perhaps try to stay away from "edging." That is getting close to orgasm but then backing off over and over. It's fun with a partner! On your own, I personally think it's part of what causes people to need more and more extreme porn to get off.
The line between healthy fun and unhealthy compulsion. Is different for each person. As long as you aren't putting off other activities in your life. Especially social ones. In order to stay home and masturbate. Then it's probably OK. I hope that seems funny to even read.

But some people do. They put off work or sleep or any social life at all. And that's very much where the problem lies.
One great advantage of a long downtime. Is that you probably have a super sensitive cock now.

Treasure that! Sorry for the lecture again.

Make sure you're using different grips. Lube from time to time. Changes in speed and rhythm. Some guys stick to one "death grip." And squeeze the life out of their boner. You can read more about that in the Erectile Dysfunction forum. Not a problem you're going to have. But worth bearing in mind. In case you've not heard of this before. So you get the full benefit out of getting your libido back finally.