It takes half an hour from Marseille to its airport. Another hour because you have to be early for check-in and 'security' procedures. Yet more 30 minutes in Pa

It takes half an hour from Marseille to its airport. Another hour because you have to be early for check-in and 'security' procedures. Yet more 30 minutes in Paris to get back to the city center (no matter at which airport you land). The high speed train stops right in the city center. So unless one of your endpoints is close to one of the airports it's 3 hours for both of them.