So I gave my address to an automated system for a payment coming in 3 weeks
I did not realize there was such a thing as a 24 hr address and I cannot change the pay to address in the automated system
What will happen?
You will get paid. There is no such thing as a 24 hr address. Address are always valid, he only important quesion is whether or not you have the private key for it. I know of no wallet that removed private keys, unless explicitly done by the user.