I would not try to start the tractor without pulling, either the glow plugs or injectors out, regardless of how long you let it sit. A friends neighbor tipped his skid steer on its side, sat over night until a local farmer came over with a tractor to right it.
He let it sit a day and half before trying to start it. He was trying to start it when I visited my friend, all you would hear is a umph, locked up tighter than a drum. I told him to pull the injectors out as the cylinders were most likely flooded. He did and they were. He got it started but it ran like crap. He brought it in and he had bent his push rods, not sure what it cost him to fix, but sure it wasn't cheap.
I agree. I would remove either the glow plugs or the injectors and rotate the engine with a scoket on the crankshaft bolt. I think the biggest mistake you will make will be to spin the engine with the starter without removing either the glow plugs or injectors.