To be honest, it was actually a lot quicker than what zpool status said. 
Not that it really matters that the resilvering time is incorrectly calculated/displayed, but it is worrying that the filesystem has bugs of any kind.
(Ubuntu 22.04.5 LTS, zfs-2.2.2-0ubuntu9, zfs-kmod-2.2.2-0ubuntu9.4)
I didn’t really have a question for the crowd here, just wanted to share the status message.