No one will be successful brute forcing it, even quantum computers, that is a legend to keep us afraid of the government agencies. During February of last year I have post a .RAR file with a 65 character password and many people here claimed to decrypting it in no time, yet it is almost one year and no one haven't.
Agreed. Straight up brute force will take too long and would use more in electricity than you'd get in bitcoin, even at peak prices. However, if the owner can provide part of the password give or take 5-6 chrs, then it's possible.
6 Chrs of ?a = 68 days, which is about $500 US in electricity. I'll burn that for .5BTC.
also, I'm getting ~250kH/s on RAR5 so 65 characters is outside of the realm of possibility.