It might be finished. Cider doesn't form a krausen, because there is very little protein in it. Lack of airlock activity is never an indication.
I agree that you should take a gravity.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk