Egg Whites.....How long before you can't use them anymore?

[Love2bake]

I have some egg white's (from Sat night) in the fridge. I was going to whip them into a merigue today but have run out of time.

Will they still be ok to whip tomorrow?

Definitely. As far as I know they're only unusable when they're welded to the bowl.

Older egg whites whip up much better than fresh!! As