current spell tooltips don't let players know the duration of a spell - the buff icon mouseovers do, but then you will have to trial and error everything... maybe proper spell cards that pop up when you right click a spell would be nice as well
Yep, I cast mage armor just to figure out how long it lasted. This is a really good idea. Maybe make the spellbook a bit more like the originals, have a full description of the spell when you mouse over it