How long is litigation hold data retain after license downgrade?

RobertCrane what's documented are the supported configurations, as in the license requirements for hold. Any configuration outside of that is unsupported and unlikely to be commented about from anyone at MS, and can even be considered a violation. Kinda like the "change the password for shared mailbox" scenario, if we are to make analogies. But feel free to probe support and/or the PG.

I have tenants where mailboxes have been kept alive for years after any SKUs that "allows" for holds has expired. Obviously this is not a supported scenario and I can expect that data to be removed at any time, but it hasn't happened for at least 10x 30-day periods so far.