I have no experience with CDG personally, I’ll share what I do know.
- If you booked passage from Spain to Tokyo the carrier is responsible for getting you to Tokyo whether you make your transfer or not. They should provide lodging and meals to cover any extended stay in Paris if you miss the connection.
- If you booked two separate tickets on your own, it is your responsibility and expense if you miss the transfer. And you most likely will if you have checked luggage. In this scenario the airline won’t transfer your luggage for you like the will in scenario 1
- In my experience (again; not specifically with CDG) an hour is cutting it close for an international layover. I have had several and many have involved sprinting to the gate. I have never missed a connection though.
- You can’t rely on running alone. You will have to go through security again in your layover city. This could be the long pole in the tent and is essentially out of your control
- Don’t be afraid to ask people for help. Let the stewards on your Valencia/Paris flight know you have a short layover. If you’re stuck in a long line at security let those in front of you know you have a short layover. Nine times out of ten, they will let you go ahead.
That’s all that’s coming to mind at the moment. Sorry I don’t have a definitive answer for you; I hope this helps though…