So the clearance controller schooled me today on the importance of not contacting him any further once he's given a release time. Apparently, according to him, if a pilot requests information on further delays once a release time has been given, the controller in obligated (by law) to call for another release time. Unfortunately for us, my naivete added 30 minutes to our original release time. Have any of you experienced this.. All you ATC types, please enlighten me.