I'm generally not a fan, but so long as its done well, I'm fine wi it. Dragon Quartet for instance had a good mechanic that really helped drive the story (granted, that was a corruption bar rather than a time limit, but similar principles apply).
Dragon Quarter? You may be one of the few who enjoyed that mechanic. --- Elice_Carol is in my sig. What do you think it means when a girl leaves a fake mustache at your house?