I think he is trying to make his body last longer. 
He believes that if he is able to push the limit, he could enjoy life longer?
I dont know if he is really enjoying life now being a lab rat, though. 

Satosora

conspiracy

Immortality Thoughts?

What is he doing to, and with his mind while he is (supposedly) living for far longer than most do today?

How will he handle it when his body inevitably fails, and his remaining consciousness will have to find its way to a new body?

What body will that be? Well, that depends on his state of mind...