Are they permanent until you touch another Stone, or do they have a timer?

I think they are a temporary buff that lasts for a good while. It sounds like it isn't permanent.

I believe they last until you activate a different stone. Not 100% sure but that's the impression I got.

Until you select another stone it you'll continue to get the bonuses.

They are permanent effects. Until you activate a different stone that is

Woot, that's what I was hoping to hear

You can change them later on if you want to raise something else. I still didn't try, but I loved this addition, it allow me to have an equilibrated battlemage if I want to do that