Well ... it depends ...
If this game will have some general time flow, and those (or at least some) timer will start not with quest acception, but with entering Act ...
I believe it would be awesome!
On the other hand, if wold stay as frozen as it is now ...
And you simply add some timer to quests, that will start count down in second you accept that quest ... it would be odd in the end. :-/
Just imagine ...
1) You rush to Druid's Grove ... you get there first, or second day in the field ... and you find out that within a week, whole Grove will be sealed by powerfull ritual spell.
2) You take your time, exploring, fighting, resting ... the usual stuff ... and you get to the very same Grove a week later than in first case ... and you find out that within a week, whole Grove will be sealed by powerfull ritual spell.
(Among other things, the motivation for stealing the idol of Sylvanus is kind of weak: why do it when your main hope for salvation is a druid?; time might be one such motivation)
Bcs he is not?
:P
