I pitched a big starter into lager for the first time about a week ago. Saw essentially nothing for airlock activity for 72 hours, and then by 96 all it was doing was lifting the inner cap of the three-piece airlock, not enough to allow a bubble to come out. Thought it was a dud so I took a sample. Low and behold it was half way to FG at ~96 hours.
Drinking: Store Bought
Kegged: Cream Ale