Jotaro may use his HHA or GHA with impunity if he has enough of the HHG left to do so. He is even capable of hitting opponents that were down when the ability was activated, 'resetting' them into a standing position once hit. The ability is best used with normal attacks in mind in order to deal the most damage within the stopped time, as they execute quickly and their damage reduction within stopped time is insubstantial.
If Jotaro's Throw, "My STAND will be the judge!", or GHA is used, time will immediately resume with the HHG drained to zero.
If fighting against DIO or himself, Jotaro can use this ability to move within the other fighter's stopped time, and may even outlast his opponent if their HHG runs out first.
Jotaro is also the only character who can counter DIO's GHA, "It's a road roller!". When the attack hits Jotaro, he will attempt to retaliate with his own "ORAORAORA" barrage. If "I stopped time..." is inputted at any point during the GHA, a special animation will play where DIO is blindsided by Jotaro stopping time and reappearing behind him, before the two clash and break away from each other. While this doesn't negate the full damage of the whole attack, it does negate the damage of the road roller's explosion and also leaves Jotaro and DIO at opposite ends of the battle arena; this makes the GHA deal less than half of its total damage, prevents the attack from KO'ing Jotaro, and resets the battle to a neutral state at the cost of 2 stocks of Jotaro's HHG.