On a slow machine it can take even 30mins.
There’s quite a bit of shaders to re-compile. You can hit Ctrl+Shift+Esc (Task Manager) and check if the UE4 is sitting at 100% CPU - this just means it has not crashed, it’s just doing its thing.
Worry not, it’s a pretty standard behaviour.
If your laptop does not have a dedicated GPU, you might not be able to launch the editor, though. Even if it does run, expect abysmally bad performance.
Hope it helps!