No that doesn't impress me. It's a trick. He's not actually in a box doing nothing for 44 days with no food. I wouldn't be impressed if he was there for a whole year. Because he is NOT actually doing it. I'm sure they have 2 or 3 guys rotating each taking a daylong shifts or so. (just like they did with the block of ice.)
If he'd let me build a cage and lock him in my office for 44 days without food, then I'd be impressed. But it's just a magic trick. The whole point is to make people believe he's doing something without actually doing it. I'll give him credit for sitting on the toilet while thinking up ways to make people think he's fasting in a box. But I'll never give him any credit for actually doing it.