I rolled back to 1803. How often does Windows Update check for updates

swarfega said:

I would check Windows Update for any CU updates that were issued for 1803.

Did you experience any problems with 1809?

Yes I rolled back to 1803 because things had slowed down considerably on my laptop

Bree said:

It's with all builds, not just 1803. Windows Update seems to check for updates roughly once a day, but...
How Windows Update works | Microsoft Docs

1809 has been withdrawn, Windows Update will not find it, either by a manual or automatic check. It is safe to click 'Check for updates', you will not get 1809 again until Microsoft have fixed the issues and re-release it.

Your Store Apps are not updated by Windows Update but by the Store itself. This runs to its own independent schedule. You can turn off automatic updates of Store Apps in the Store's settings, if you wish.

Thanks Bree once again for your help

sportsfan148 said:

If you don't check manually are those non-essential updates flagged up somehow or is it a case of if you don't manually check for updates ever then you just wont see them?

You won't see them because they will be installed automatically in the background.