Amikiry
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As I already commented where you stole? this fanfic from, he will have something around 5,747 * 10^1097 times more mana than an ordinary person if he can spend all the Mana every day for 10 years. Thats bs.
Maybe she had a team. Or SI's skill issue. Either way, this technique won't work on her. Firstly, there is no reason why it cannot be blocked by Susano, and secondly, she has very great mental power, it is even possible that it will be Yamanaka who will suffer.(Susano is dense chakra, and all techniques in Naruto are made up of chakra, even genjutsu and mind techniques. No technique can simply pass through it. It must either be bypassed or destroyed.)
I don't think that a person really has all the available life force at one time. Most likely we are talking about wear and tear on the body. If he doesn't use skills and elemental bursts and gets good rest, I don't think it will have much effect on his life expectancy. Simply infusing a weapon with an element can be very useful though.
This is just charity and MC is crazy self-centred why would he do this? I'm pretty sure that potions are standardized and his talent won't help him. At best, crafting crits will increase efficiency by 20%. But even in this case, he will force other masters out of the market and he will have to finish the job or he will do more harm than good. That means he will have to sit and make potions without being able to stop.