Skybox importing on Android Platform in Unity for Quest is taking hours/days...

Hey Devs, I had built a small app for Rift and now trying to port it to Quest. When I switched platform to Android in the Editor, the library is rebuilding as there is a change in platform. The import time for skyboxes is taking hours and sometimes the editor is getting hanged.

Can anyone shed some light here on importing skyboxes in Android platform?
Btw I have been using Unity 2019.3.0f6