Most of the issues come at the VERY end, if issues arise: And most of these are detected within seconds.
For example, il2cpp:
At the very beginning of building your game, it should do a hello world il2cpp compile to test for errors BEFORE waiting for everything else. Il2cpp isn’t the only thing that can do this: There are tons of errors that are only detected at the end that could easily be tested at the beginning.
TL;DR: Please include some integrity checks (especially with il2cpp) BEFORE the lengthy, main compile.