Is it just me or does JL have really bad utilisation of its fleet of 13 777-300ERs?

13 frames translate to 13 x 24 = 312 plane-hours a day
Block times of all 14 flights = 171.25 plane-hours
https://www.jal.co.jp/en/inter/service/rosen/suite.html
Turnaround time assume 2:30 x 14 = 35 plane-hours

Utilisation = (171.25 + 35) / 312 = 66.1%

If we assume that JL has determined that there should be 1 frame idling as a reserve for IRROPs at all times, and 1 more in maintenance checks:

Adjusted Utilisation = (171.25 + 35 + 48) / 312 = 81.5%

With 57.75 plane-hours in hand every day, JL appears to have the schedule flex to convert one more North America destination + one Oceania destination to 77W service with F on a daily basis.