06:00 - Get up
08:00 - Arrive at work after commute (train but about 5k cycling in total/day)
13:00 - Lunch
17:30 - Leave work
18:45 - Arrive at home
19:00 - Mount the turbo
20:30 - Dinner

I calculate that as about 16 hours between the end of your dinner at about 21.00hrs until your lunch at 13.00hrs.
Breakfast is VERY important, don't skip it.