A carrier operating at sea on the other side of the world is a ton more expensive than a carrier in port at home. The Ford in particular would probably be in port now if not for these back-to-back expensive adventures, they’ve been deployed for a remarkably long time now.
(As for whether this reflects only those added costs, I don’t know)
True.
Honestly i think my main opinion is that we have no idea what the number is, but its probably a large one.
Carriers routinely engage in war gaming and cruises. They dont port if they are not actively engaged in war.
Carriers aren't meant to hang out at port at home. The US has protected global sea lanes for 80 years.