Document Understanding license consumption

Hello,
I have a question about the type of licensing on Document Understanding. Specifically, how is this license consumed?
If I buy a bundle of 40,000 pages, do I have to use them within a year? If I don’t have to use them in a year, and for example I have 5,000 pages left, when I buy another 40,000 page bundle, will I have 45,000 pages?

Thank you very much !

@DragosPadurariu

I would request you to connect with UiPath sales team for this query. They will guide you better in this.