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54:26>> Yeah. And so the first myth which is one that always comes up immediately. I was shocked in our video last video about Artemis which was in the rundown and it was barely anything >> and everyone was just going crazy. >> Yeah. And I didn't expect it. Myth number one is about Van Allen uh belt radiation or van Van Allen radiation belts being impassible. Yes, this is myth number one. Yes. So what are the Van Allen radiation belts? Well, the Earth has a magnetic field and so it traps radiation from the cosmic background from the sun from all over the place into these sort of donuts
55:07around the Earth. There's an inner belt which is mostly high energy protons and then there's an outer belt that's mostly high energy electrons. And the myth is that you can't go through without killing yourself. That is totally false because the transit time you can actually calculate the transit time. We're going at about 11 km/s. Let's say even slower 6 km/s which the escape velocity of the Earth is 11 km/s. If you were to calculate how big that belt is, you spend about 8 minutes through the core and about an hour through the whole thing. >> Now, the Apollo missions had shielding. They had aluminum blocks that would
55:48block alpha radiation, which is helium nuclei going through and beta particles. And it's effective against most particles. But, you know, you still have to be concerned about bremaling radiation, which is when electrons come through and they slow down. And if they electrons slow down, then because of electromagnetism, they're going to release light. And that light is usually in the form of X-rays, right? So, so there's going to be some X-ray radiation. Well, the result is that the Apollo 11 dose was about 0.8 0.18 rads, which is comparable to CT scan, >> right? It's far below the lethal dose of 400 rads. >> So, if you have had a CT scan, you've had as much radiation exposure as going through the end belt.
56:28>> Yes. And um to with Artemis actually what I found was really funny was the Artemis 1 which is the mission that preceded Artemis 2. They had mannequins called Helga and Zohar that had active domters which are you know radiation meters that track the amount of radiation that they're getting. >> If you've watched Chernobyl, it's the thing that go