Hi JOEL welcome to the forum.
There isn't as such a definitive lifetime for the pancreas, some report reduced insulin requirements for a year, some for a few. It seems that the better your control, the longer the pancreas can continue with what support it can as it's less stressed. Keeping well and exercising can also help with maintaining reduced insulin requirements. Whilst this is going on its good to read up and become an expert, there are some good type 1 reads out there such as 'think like a pancreas' and 'diabetes solution'.
I am going to move your post into the type 1 section so more type 1's can see it and respond
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