How long can a shield/block that belongs to Ganondorf last against an aggresive Little Mac?

In all Super Smash Bros Titles, players can block. When they block, the player gets a bubble (shield) around them that absorbs damage and even reflects some attacks. But, if a player holds it for too long, or takes too much damage, the shield will pop and they will be stunned for a considerable amount of time. What precentage of damage does it take for Ganon's shield to break?

It would be with no items and no custom (for Glory).