Does anyone know if there is a minimum time that an airline has to leave before reusing the same callsign?

I have noticed that airlines reuse callsigns, they usually leave a day or two between reusing them. I'm just wondering is there any regulation on the minimum amount of time that must pass before they can reuse the same call sign again?

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    $\begingroup$ Usually the call sign for a flight is the airline plus the flight number. Many, many flights run the same number daily, which means that the call sign is reused daily. Do you have some reference that they "usually leave a day or two between reusing them"? $\endgroup$ – FreeMan Feb 10 at 17:53
  • $\begingroup$ Related: How are duplicate call signs dealt with? $\endgroup$ – Bianfable Feb 10 at 18:17
  • $\begingroup$ @FreeMan - thanks for that. No hard numbers, just something I have noticed looking at ADS-B networks. I'm developing an application which monitors flight cycles and want to know if there is any regulation regarding the legal amount of time that has to pass before a particular call sign can be reused? $\endgroup$ – Simon Mullaney Feb 11 at 9:19

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