I don't want to be a nag so this is the last post for me on this subject.
But I'm a barefoot runner, I log about 20-25 miles on road surfaces all barefoot. It sounds crazy right. Well There is a term in running TMTS (Too much too soon) and that's when you start barefoot running and do say a mile before you are ready. Well you end up injured. It took me a 6 months to go up to 2-3 miles and then within a year I went up to 10-15 mile runs then a full marathon within 2 years. In barefoot running you start with 100 yards at a time, and increase that weekly and in time you can run as long as you want.
My point is that even 30 minutes might be TMTS for you at this point. And the initial tingling is a clear sign that spells DANGER DANGER! At this point you need to back off completely until your right hand feels 100% ok, then slowly go back in very small increments.
The other point about a 30 minute practice session is that it becomes counter productive. Your mind\focus\body works like the standard bell curve. as you warm up, you focus, you learn you develop good technique but at some point you reach the top of the curve and the curve starts sliding back down. When this happens you start getting sloppy, unfocused, and injured. And worst than that you end up reinforcing bad technique and everything that is associated with the descent of the bell curve.
The trick is to learn where that apex of the curve is for you and then stop while all systems are working at their prime, before the eventual decay. For each person that apex will be different, and it will also change over time.
For me with music the apex seems to be between 20-30 minutes in general and for something like a difficult technique it might be as little as 10 or 15 minutes.
In any case, like barefoot running, playing\practicing guitar should never feel like work, never hurt, or stop being fun...
I apologize if I sound like a nag but I found that this works for me, and I wanted to give a non-musical example to show that this works for much more than just music.
Now I will get off my soapbox
I wish you a speedy recovery, and a lot of success in your Journey.