In how many Olympic Games were Spartans banned from participating?

The Olympic Games began to be held from the 8th century BC, but the Spartans themselves, according to the laws of Lycurgus, were prohibited from taking part in them. Despite this, many were there as spectators, and we know Spartan winners such as Filimbrot, Lad, Callitel. Mostly Messinians or Lacons participated. Once, during the announcement of the Olympics, Sparta laid siege to a hostile city. This was contrary to the accepted rules of the world during the competition, so the Spartan policy was suspended from the Olympic Games for 20 years (5 games).