Cryo-chamber is amazing. I wish I was able to do that every day lol. But... expensive stuff. Though, if I am being completely honest, I'll put my money into a float tank first.
A.) Plenty of people spend a large amount of time in prayer. A half hour does not seem that out of the realm of realistic, depending on your faith.
B.) I'm pretty certain he doesn't spend the FULL 30 mins praying. That's just his timeline.