Migrating from NW51SP8 to NW65SP7, migration wizard README states that there
will be problems if your source server has subdirectory levels more than 20
deep and they recommend that you re-organize this before starting.

Is there an easy way for me to find out where I would have subdirectory
levels more than 20 deep? I could be here for quite a long time if I have
to start poking around and counting manually...

On the off chance that I have more than 20 levels deep, does anybody know if
the error shows up in the prep for migration (not so bad), or does it only
happen while it's actually doing the migration (would be gone by then to
leave it run overnight - this would be bad!)?