https://www.theregister.co.uk/2018/05/31/windows_10_spring_2018_update_hits_half_of_users_within_a_month/

Tracking company AdDuplex has given the first real indication of how fast the latest Windows 10 update is being rolled out. The answer is fast. Really fast.

In the absence of concrete figures from Microsoft, the independent ad tracking network shows the Windows 10 April 2018 Update on 50 per cent of Windows 10 installations a month following release. This is the fastest rollout of a Windows 10 update in the history of the operating system, according to the ad-flinging outfit.