I honestly wouldn’t like to say. There are too many variables to factor in. Last year was a bit out of the norm due to the race being stopped then restarted, which had a knock on effect which delayed everyone getting back. You may get lucky and get into the station quickly, or you could get caught up in the queues outside the station which will hold you up for quite some time. Sorry I cannot be much more help – we are never in a hurry to get back to Nice, so just take our time.