Given they are an overnight in not sure they would do a third full meal service as people will want to sleep. Not sure when would schedule it while letting people get an uninterrupted sleep period.
Will be less than 16h between meals. In Y most probably looking at 60-90 before service starts and will start breakfast 2-3 hours before landing. So more lube 11-12h between meals and add in a 8h sleep. Will likely be some nibbles I in IFE or in galley.