Kerbals recovered from orbit via contracts have indefinite home and habitation time

[astrolamb-gaming]

If you accept a kerbal recovery contract, the kerbal in question can stay in orbit indefinitely if they are not returned to kerbin first.

[Mathmagician8191]

The kerbal with indefinite hab time is a pilot, I think there is a feature where 1 year of habitation is enough for pilots and will display as indefinite, while other kerbals need 50 years of habitation. To check that you could put them in a craft with less than 1 year of habitation and see if it still shows as indefinite.