RBR is the only one that did long runs, likely with a full tank. We finally hear the Honda engine, although it has not been fully unleashed yet. This was a shakedown, and the unfortunate wind curtailed the day, as it will tomorrow. There looks like there's still parts to go on these cars, this is a dress rehearsal after all. Not a good way to start for Mercedes who have traditionally been faultless with reliability.
From what I can see, no one has laid their hand yet. No one does on day one. This is just to get a feel for the car, the second day is to set it up, and day three is to see where it stands.