Is It Possible To Exhaust The USN Of A Domain

Greetings,

I'm going to be using a script to update the description field of a computer account in AD using a logon script, which updates the field to show the last logged on user and the date, we have around 12000 users in total with I think 70% at least of them hot desk quite a bit so this information could change daily,

My questions is around the USN I have read posts about you have to be careful not to exhaust the USN as if this happens your kill the domain, and other posts saying you can exhaust the USN but it would take a very long time and that it would just roll over.

So my question to you would be is it possible to exhaust the USN and would it kill the domain or would it just roll over. I asked this question in the scripting forums as im new to scripting and there have said that you guys could give a more detailed answer:

https://social.technet.microsoft.com/Forums/scriptcenter/en-US/37f25d34-1ba4-4c50-86fc-a01ff900c013/automatically-populate-the-description-field-of-a-computer-account?forum=ITCG

Regards

S