Earlier this week, Microsoft released June 2023 Patch Tuesday update for Windows 10 users. Distributed under KB5027215, the update addressed security issues with no specific details about the changes or improvements.
It looks like the update may have brought over a bug causing systems to install the patch slower than usual. According to user reports on Reddit (the subreddit is currently restricted), KB5027215 is taking more than half an hour to install for some users, with clean-up process post-update taking most of the time. The issue has been reported by multiple users and is happening when trying to install the cumulative update along with Microsoft .NET updates.