Michelin Three Star Restaurant; but if the chef is not there
3 star restaurants are a business (*); for (probably bad) example, if I was to buy a Tesla car, I would not expect Elon Musk to build my car or even be at the auto-dealer.

Chefs will rarely cook; they will create the dishes, they might cook the prototypes and do trial plating to show his staff how the dish should cooked and presented; and the team will do the cooking day-to-day.

Chefs do high-level business management (human resources, produce handling and buying, do PR,...) and that takes time, they are not superman, they need to sleep and rest.

If they have to cook or be in the kitchen, then they need to be there early in the day for lunch preparation, they need to be there in the evening up to late because client will usually leave dinner at around midnight-ish; it is impossible to keep that schedule.

They will even be traveling to their other restaurants or do special appearances at food festivals around the world.

For example Pascal Barbot of the 3 star L'Astrance in Paris will be in Montréal for the Omnivore festival this week-end, so he will not be in Paris to "cook" or handle vip clients (in that case, maybe the restaurant is closed in august, I  don't know).

(*) All restaurants are business, but 3 star michelin are the top of the pyramid.