[vorlon24]

My method is much more convenient:

First of all you hear a creak on the stairs of someone approaching. Then the question: what do you want to eat?

Answer given, creaking sounds retreat.

Some time later (exact minutes not known as normally too engrossed), a tray with food and cutlery on appears.

Down time from computer: 15 seconds. That's broken down into 5 seconds for deciding what I want to eat, and 10 seconds to pick up the tray.