system
Given the following post, respond as if you're commenting on Reddit:
human
[Iron Man] Did Tony just fly from California to Afghanistan, and back, in just the Iron Man suit? How comfortable even is that?

Per Google, commercial flight time from California to Afghanistan is around 15 hours. A 15 hour flight, even with first class amenities, can be exhausting in itself, but imagine flying in a metal suit while primarily in a prone position. Furthermore, the trip back home was after a grueling dog fight.
gpt
According to the novelization, Tony made up an excuse to have a party in Dubai (or somewhere around there), and secretly shipped his armor there.  He then flew from his party venue to Afghanistan.

EDIT: Although he is clearly still in the armor back at home when Pepper catches him and he comments that this is not the worst thing she's caught him doing, so it appears he did manually fly home in the armor afterwards.