I never knew that they were have said to fail the inspection in the Borg lit. That's fascinating.
As for the time period of inspection, I was under the notion that it begain in early 1918 (I forget the supposed date) and ran for 18 months - ending in late 1919. So either year could be used depending on whether you're talking about when the inspection began or when it was completed.
Regardless, there is no evidence any inspection ever happened and if it did, there is an equal dearth of evidence that the Watchtower was chosen as faithful and discreet and then appointed over all his belongings. AND, there isn't any evidence that YOU or I are supposed to be considered "belongings" OR that Matthew 24:45 is even a prophecy.
It's a big pile of bullshit.