I would agree with Fran. It will not be a problem. If all you're doing is starting it briefly to verify that everything works, this will not be a problem. I would recommend doing as the instructions indicate above, as far as cranking the engine long enough to get oil pressure before you start it. I usually accomplish this by simply unplugging the fuel pump while cranking.
To add a bit to this, I would also check everything you can on these engines before starting. I have yet to get a GM crate engine in here that does not have "issues". As many of you have probably already heard, the assemblers at GM are pretty good at cutting the O-ring on the oil pick-up tubes on these engines, resulting in no or low oil pressure.....which is why I would highly recommend cranking until you build a significant amount of oil pressue BEFORE starting to verify this is not the case with YOUR engine. I've had LS crate engines come in with all of the oil pan bolts left loose. I've had LS crate engines with all of the bolts on the entire rear engine cover left loose.....which you normally wouldn't think to check on a brand new engine......and once the flywheel goes on, you can't get to them to check them.....and once the engine is started and you find out there is oil pouring out of the back of the engine, you have no choice but to pull the trans, the clutch, the flywheel and fix the problem. I had an LS crate engine that they left the harmonic balancer bolt loose, and after my customer took delivery (in Germany), the bolt backed out and wore a hole in his coolant line, which dumped all of his coolant out on the street and stranded him in the middle of the street. I've had an LS crate engine that we spent 2 entire days at the dyno tuner's trying to get it to run right.....and found out at the end of day 2 that all of the intake manifold bolts were loose. On this last LS engine I got in, while pulling the valve covers off to swap them side to side, I found the heads laying full of bits of what I'm assuming is dried thread-locker, and one of the valve cover seals was rolled over and not making contact with the head, which would have resulted in a huge leak (you can see in the center photo where the seal was running....and ran right off the sealing surface):
In other words, what I'm saying is that, while the engine is out of the car.....or at least before you start it, it would be best to double check everything you can to be sure that at least everything is tight. Do not assume that your engine was properly assembled at the plant. Maybe I just have the ultimate bad luck with GM stuff.....YMMV. By all of the guys on the GTM forums that had new LS3's with no oil pressure, I know I'm not completely alone.