How hard to build apk, ios, pwa from existing source codes for person who has no exp in ionic?

Hi

We have someone developed a complex angular ioinc 5 app with full source codes and plugins. I wonder how long it would take a person who has no exp in ionic, and learn to build apk, ios app and pwa from source codes.

the person has knowledge developing website.

thanks

ask the person to pull it off with a basic starter app using capacitorjs.
If the person cannot manage in 1-2 days, then I would have some concerns.

With the existing app - it can be as easy as that or very difficult given depenencies. And any thing in between