Team time trials have tended towards shorter distances in the Prudhomme era, as the Tour de France director is keen to avoid teams that aren't blessed with a strong group of rouleurs being dumped out of the contest for the GC with the race only a few days old. That said, this is a flat course with plenty of long straights where stronger teams will be able to sustain very high speeds. There are also some tight-ish corners, so those outfits that have been working on their strategy should be able to gain some useful time.
It is instructive to look back at the time gaps recorded in the Tour's last team time trial at Les Essarts in 2011. The course that day was 23km long and similar to this in terms of profile and number of corners. Garmin won it, putting Thor Hushovd in yellow, while six other teams finished within 12 seconds - Katusha and Movistar were among seven teams losing more than a minute.