If you are on a windows machine and have powershell access and know how to deal with csv/excel, you can also use a script to create a list off your filenames and their length.
Try to understand what this script is doing! Do not just execute anything you find on the internet!
(I love this 
)
gci D:\PATH -recurse | select-object FullName, @{Name="Nlength";Expression={$_.Name.Length}} | sort-object FullName | export-Csv -path D:\listD.txt
Please replace D:\PATH with the folder you want to check (or your vault drive letter) and D:\listD.txt with the path and the name you want to have the results stored.
This is just a dirty script. It will show also folders containing no files at all and will then display the count of the folder. So you have to manipulate the output and exclude everything you don’t want to have here.
But its just a small step from there to come to the requested results.
Here we go, my results:
Files actually IN vaults
total: 33419
longer than 80: 74
longer than 146: 0
ALL files on system (excluding encrypted vault files)
total: 314036
longer than 80: 82953
longer than 146: 9