56:27 And that means that for a home energy storage battery, the likes of which PowerVault make from second life EV batteries, or at least one of their product ranges that they do ones with brand new cells as well. You know, you're you're looking at many years of of easy life for these cells, which would otherwise have been prematurely retired. So, yeah, I reckon we'll we'll see an interesting mix of the second life EV battery within the domestic energy storage scene. We'll probably see, you know, LFP, sodium ion. And then yeah, I mean, the the likes of Tesla, they are using NMC.
51:32 But that said, you know, the existing lithium ion Gigafactories, which may not necessarily be perfectly tooled for creating solid state lithium cells, you know, 1,000,000,000 have been invested. 1,000,000,000 of dollars have been invested in all of these 100 upon 100 of gigawatt hours of capacity. So lithium ion is still here for the foreseeable future. There will be other chemistries which can be produced on lithium ion production lines like sodium ion, which you take a hit on energy density, but there's about a 30% cost reduction. So, you know, that would be used for your kind of cheap and cheerful entry level EVs that would be used for your electric buses and things.
52:09 It would be a competitor for LFP. Interestingly, with LFP, though, we now have Tesla using LFP in the Chinese built model 3 because CATL, gigantic, you know manufacturer of our batteries over in China have developed this cell to pack packaging methodology that means that LFP which is less energy dense can actually be packaged in such a way that you can get a good couple of 100 miles range out of it, which was previously unthinkable. So, yeah, solid state. I think it will be used in premium EVs. It will be used in stupidly long range EVs, but I'm keeping a close eye on LFP because that, you know, and potentially by extension sodium ion because, you know, this cell to pack packaging methodology, you're combining that with a material which doesn't contain cobalt, doesn't contain nickel.