Hans is using now 3 (three !!!) additional digits for 6.01 beta versions.
For Beta 5.10 (finally released as version 6.00) he only used 2 additional digits and you know where we ended: 81 beta versions (plus some A and B sub betas) !
(And I guess that this experience lead to the conclusion to use one additional digit in the future)
So, when Hans is now using 3 additional digits for 6.01 beta versions I can imagine where (and when) this will end.
The truth:
It was me who asked for this beta naming scheme of additional digits, because before it was very difficult to know what beta versions where used by different users (because all beta versions had the same name).
Yes, I am guilty.
But in the end IMO it really helped during the whole beta development phase to be sure that we were talking all about the same build.