If I take a flight on British Airways, I can make it back to Tokyo in under 16 hours, assuming I’m able to book one-way and make it to the airport with enough time for international security. Given that I’ve been issued my replacement passport, and Mum is willing to drop me off right at the terminal… one checked bag, one carry on… 43 minutes travel time from the estate, approximately 30 minutes for express security diamond, 10 minutes to the gate, 12 hr 5 minute flight, another 25 minutes to get from gate to baggage claim and to the curb, and a cab to my father’s home…

Adjusting for the time zone shift and the demonstrated personal set-in time for jet lag, I should be able to make it in time for afternoon tea before passing out in the ensuing fifteen hours that follow, putting me at a 5:30am wake up, just in time for my routine jog and back on schedule for the court appointment at 10:45am.

Then it’s all a matter of supplying the collected evidence, my carefully rehearsed testimony, a persuasive argument regarding the inevitable plea bargain, and celebrating the predicted verdict. 

All according to keikaku.