I did it

Went to bed on May 21 at 3am, got up at 10:30am, hopped on a plane at 4:40pm, went to bed in Moscow on May 23 at 3am. Met everyone I meant to see in Moscow and even more (or at least talked on the phone).
Alive and sane (just kidding).

Using my half-an-hour of free Telecom wi-fi in Friankfurt airport. Boarding right now.