My mac cant use the screensaver for very long

Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes.

Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.

To find out if it's system wide or user specific, try this...

Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.

Does it work in the new account?

I_need_help_ty wrote:

It won’t let me use the setting beyond the five minutes

Sorry, you're going to have to actually explain what you're doing and what happens.

That statement is no more informative than your original post.

Please repost the question in the Big Sur forum.

What happens after it's been running for 5 minutes?

That setting means the screen saver should not start until the Mac has been idle for one hour...