[zrail]

19 hours and not over water which constrains them quite a bit. If they're going to run laps around the continental United States, why not make it fun?

[toomuchtodo]

Even with multi-engine they can't run over water for the certification?

[Sanddancer]

It's a test flight, so you want to keep near some sort of airport in case something goes wrong. So yeah, you could duck over the ocean, but you really don't want to be flying in areas that could be problematic for too long in an untested plane.