Question:
Is there a limit to the number of times a commando unit can retreat before combat? For example, if an SAS commando is being overrun by a panzer division, it can retreat before combat because overrun is a combat. Theoretically, however, that division could overrun more than once. And if you had multiple divisions, the commando could end up retreating several hexes from its original location.

Answer:
No, there is no limit upon the number of times a capable unit may attempt retreat before combat, or retreat before overrun.

Note also that such units can not retreat before overrun “because overrun is a combat”, an overrun is not combat! They can retreat before overrun, a totally separate concept, because the rules say they can. This is not just nit picky-ness, there is a real difference between overrun and combat and the rules attempt to portray this.

Source:
TEM 53