Although your question is general, the answers will certainly be specific to the engine type because of design differences. The MM quotes by spannersatcx are good practice in any event, but check the MM for your specific aircraft/engine model.
For example -
-Are the engines limited (in time) because of the fuel is shutoff after extended windmill? since the the fuel pump and the the fuel metering valve are not lubricated.
Most fuel system designs I am familiar with ARE fully lubricated (by recirculating trapped fuel) during windmilling, and thus have no time limitations in windmilling. Once again, your mileage may vary.