Update for Windows XP (KB898461) 477 KB , less than 1 minute This update installs a permanent copy of Package Installer for Windows to enable software updates to have a significantly smaller download size.
Microsoft would not be daft enough to deny anyone security updates (at least until XP is officially fully deprecated) as the extra abundance of hacked Windows machines causing hassle would be extra embarrassment.
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I am about to apply updates to a windows xp installation I have not booted in a couple of years.
Most content is available for 24 hours, and some lasts up to 48 hours.
The video description shows how long the content is available.