So “When you cast a … spell” wording applies abilities to spell for duration?

Overchannel. By RAW, it works as long as the spell lasts. Not exactly the intent (works only on the first turn), but it's functional. #DnD https://t.co/5ibPHCypsJ

— Jeremy Crawford (@JeremyECrawford) November 14, 2016

@quadhund so “When you cast a … spell” wording applies abilities to spell for duration? Bigby’s language implies otherwise 1/2 I ruled on the wording of Overchannel (an exception). The wording of an exception has no bearing on the general rules.

— Jeremy Crawford (@JeremyECrawford) November 15, 2016