How often do mc'deals reset?

So I just started using the McDonald's app because they're on my way home after selling my plasma and I really like their free fries deal and of used it on both my accounts

And I'm wondering how often the deals get reset or updated? Because it doesn't seem to be a weekly thing ,is it once a month or is it a one and done thing you get the deals in the app and they never get updated?

I'm just wondering so I don't have to rotate and make a crap tone new accounts and have to uninstall the app every two