In my case it is just for the present session. At least let me play Solitaire while the updates are running. And I always shutdown at the end of my day or end of updates hence uptime is not an issue for me.
In the /home directory, there should be a hidden directory called .kde which mostly contains KDE settings for your user. Rename it and check. A new one might get created with default settings during next login.
Caution: I am no expert and consider all backup options before doing this because it may force you to re-install.
Edit 1: based on additional searching due to comment below, it was ~/.config for KDE 5. I have no idea of what it is for KDE 6. May be you will have to go through source code to find.
In my case it is just for the present session. At least let me play Solitaire while the updates are running. And I always shutdown at the end of my day or end of updates hence uptime is not an issue for me.