Here is what I have been thinking about:
Kaliningrad is 10 hours ahead. He arrives home on Sunday evening. Because of the time difference, he departs Kaliningrad on Saturday night. Right now it's Saturday morning (there). Which means he's leaving tonight according to his clock.
According to mine, he's leaving tomorrow night. What adds to the weirdness is the feeling of time stopping when you are on a plane. Like that time doesn't quite count somehow.
He's sitting in Kaliningrad thinking,
"I'll be on my way home tonight."
and I'm thinking,
"He's not going to be home for another 2 days, he's not leaving until tomorrow night."
Those two points, while one is much farther in the future for me and despite the fact that we are existing in the same moment presently, are actually one point: the point he arrives.
Alternatively, on the way there, he spend 2 days traveling. 2 days were lost to him, as the plane flight was not 48 hours - during this time loss, I went to work twice and had 2 full days.
What a weirdly exhilarating feeling.