How much time will the May 2020's Windows 10 Update take? (Feature update version 2004)

I’m about to get the “Feature update to Windows 10, version 2004”. How much time will it take? And are there any bad effects after the update??

For the May 2020’s Windows 10 Update to get downloaded, it will take around 2-3 hours (based on your internet connection speeds), so it’s better to download it in the midnight.

Once downloaded, it will only take around 1 hour for the complete update to get completed.