I'm sure you already now that, but the thing about consulting is that :
From one assignment to another working hours can change widely. That is explained by the fact that with different clients, teams, projects content, your workload can be highly variable.
Now for the French market, you can expect an average of 60 hours a week within the strategy practice of a Tier Two consulting firm with regular peaks to 65/70 hours.
Again, this is only an average from discussions with tens of consultants from these companies to give you an idea of what it is going to look like.
Best of luck for your next move.