I haven't seen any evidence that Mercedes has published anything about the specific intervention interval, but even so liability is discovered in court and Merc

I haven't seen any evidence that Mercedes has published anything about the specific intervention interval, but even so liability is discovered in court and Mercedes can't just wave a wand and say "we aren't liable because we deactivated 0.001 seconds before the crash!". It would definitely be very disappointing if they tried to exploit the loophole but if they did its very possible that a judge or jury would look at Mercedes encouraging the driver to watch a movie and tell them and their loophole to pound sand.