I would also like to make this clear to all that in developing countries for example,they allow you to fly in the country as a flight crew without even doing a conversion of license..
Where there is no Conversion required,a simple Validation would be enough for one to be able to fly in their country..
Validation: When a State validates a foreign licence, it recognizes it as valid for use on aircraft on its own registry.
In general, the validation process is used for short-term authorization while the conversion process is used for longer-term authorization.