it's called reruns, and commercial stations in Europe are really good at it.
There's some stations that have programming repeating itself twice (or three times) a day with a weekly schedule.
So they have one set of programs for monday (running from midnight to noon and again from noon to midnight, one set for tuesday, etc.
This is then repeated every week for say a month before being replaced by another set.
I've seen some stations so desperate to get cheap TV shows that they run reruns of gameshows several times a day and just run the same batch again a few months later...
And of course there's the eternal series that never die like M*A*S*H* and the A-team which I've probably all seen ten times or more yet never (and that's rare) tire of