For isolated machines it's not uncommon. The process to re-approve a machine after a bloody update is painful(to say the least). Even for something as lousy a

For isolated machines it's not uncommon. The process to re-approve a machine after a bloody update is painful(to say the least). Even for something as lousy as a BMS system of a reasonable size (100 bacnet controller) will still take 1 week or more to fully test and approve. Keep in midn that these are machine where the only things that you can plug in are those whitelisted at the end of the test. Even the approval to replace a keyb+mouse set takes a few days and requires a sys admin to go to site.