For each page, you can set `fallback: 'blocking'`. If set, the page is not built at compile time. Instead, it will be compiled the first time it's requested. So the first request will take longer, then after that it'll be fast.

Alternatively, on a per-page decision you could decide to use server side generation (page built at compile time) or server side rendering (page compiled when requested).

You have options that let you spread out the time, but ultimately it's going to take time to build millions of pages.

Like acoard said below, I think the recommendation there would be to use their hybrid cache / dynamic rendering option. You do lose a lot of the cool benefits of being fully static in that case though. In general, yes that kind of documentation would be very helpful.