Actually you can (almost surely) stop cracking at 16 bytes, because that's how long MD5 digests are and any more bits than that are going to give you hashes you

Actually you can (almost surely) stop cracking at 16 bytes, because that's how long MD5 digests are and any more bits than that are going to give you hashes you've already seen. You won't get back the original string but you don't need the original string.