I just have installed unreal engine 4.25 and it looks that it’s stuck on 45%. After googling, i came to know that it’s compiling shaders. And yes it’s using a lot cpu power.
But the real question is if I shut it down and open it later will it continue from where it left?
For example its gonna take 3 hours on my machine, I wait for 2 hours, shut it down and then wait 1 hour the next day. Is that possible?
Thank you! 
I have found some logs in the following directory:
C:\Users\ <$username> \AppData\Local\UnrealEngine\4.25\Saved\Logs
The log indicates how many shaders are left to be compiled.
But i’m still not sure if it will continue from where it left, when Unreal crashes during the process.
bump
I couldn’t say with 100% certainty that it won’t check the files its already done, but it will (should) continue from where it left off.
In my own experience when UEs requirements outstrip my system and/or GPU memory the process does start from the point of crashing.
Can still take a while to complete mind.
I’m pretty sure it will continue where you left off, but you should nicely shut it down first. If you just terminate the process, it may recompile all shaders.
same here