Inquiries about student pack benefits

Thanks for providing me with these helpful links.

I have been reading some of the articles and discovering stuff on my Atlas account for a while. I would like to clear up this doubt related to the access code and Atlas.

If I redeem my access code, it will be applied to an organization I own. if that’s true, does it mean I can use these credits anytime to make a purchase like upgrading my cluster?

I wanted to know if reedeming my access code will make these credits for limited-time use only? Like you must use them before a period of time.

Thanks again for your help.