As of 10/04/2018, 1809 version was 17763.1. No issues with upgrade at that time.
November 14th updated to 17763.134 and the security updates were for Flash, MRT.exe, and Cumulative Updates. Not much time required to update as all updates seemed to be mostly minimal.
The last one for 1803 (17134.320), done on 10/01/2018, which was much larger and took thrice as long to complete as this one did.