I think i would have the ability to stop time for an indefinite amount of time (so i would be able to whenever i want stop time for as long as i want, move around and do whatever i want, then unstop time whenever i want) without any kind of side effect or drawback. I personally would use this for a bit of both good and bad. I might for example help out people every now and then, but i also would use it for selfish reasons as well. Mostly for good, but i doubt that even super heroes dont like to use their powers for selfish reasons every now and then ๐, for example in the shazam movie, shazam used his powers to get money out of like an atm or something. I wouldnt do mass crimes or completely evil things like arson or assault or what not, but if im facing a school bully, i would then be able to when im not close to him at all stop time, go over to him and beat him up since he probably deserves it. Stopping time wouldnt need to say anything specific or move my hands in a specific way to avoid suspicion in class for example.