A monkey could win games by timing down, most villains will just give up and sit out...or open shove after 30min.
Yes, it's within the rules (although I don't get why)...and yes, it's frowned upon, unethical, and no matter how much you win, it's nothing to brag about, ever. You use a software mechanic to win, not your superior poker skills.
Oh, and everything Mers said