A cybersecurity breach is not the same thing as a DDOS attack, they are very different.

A DDOS attack is actually pretty easy to defend against, just a question of spending the money if you weren't prepared ahead of time, a cybersecurity breach, that's a whole another can of worms - how long that takes to recovery from depends on if you have backups of everything and had the right recovery procedures written and ready to be implemented, that's after you've determined/mitigated how the breach occurred.