[Christ]

Ok, it won't kill your transmission, because you have no way to introduce torque from the wheels back into the transmission. Unless you have a fluid pump at the rear of your transmission, which you probably don't, it won't start your engine back up, either.

Essentially, unless you're pumping fluid, the transmission won't go back into gear at all, so you'll remain in neutral, until you start the engine back up and introduce fluid sufficient to fill the passages under pressure and engage the Drive gearset.

While it's not going to do anything for you, it's also not going to harm your transmission any more than coasting engine off in neutral actually would.

IOW - don't do it.