Harmful to run btcrecover on macbook in the background

I am using a token that is the approximate length of my password for an old forgotten blockchain wallet from 2015. It has .48btc currently sitting there. I havent been able to guess it yet which is very surprising to me frankly...and concerning. So i am using btcrecover with a single token that is the suspected length and contains the characters I think must be in it. It says its going to take 20 hrs to finish, but my computer is already feeling hot and its scary to think of leaving it like that for 20hrs.... What can I do in this case?