If u accept a quest wil the quest giver get annoyed if you take ages to do it
The game doesn’t wait on you.
If its a time sensitive objective you will fail and events will play out on their own.
So yes if you get called to get help and take to long to get it it could mean dire consequences.
It will depent on the type of quest. There are quests where time is relevant and there are quest where time is not relevant.