I like short 10 minute dry fire sessions. Short attention span I guess. If I have company, then we could have a little match and of course that would take a lot longer.
I have switched my 9mm laser bullet back and forth between two super high quality guns (Sig P210A and CZ 75 Shadow Custom Target). I do not have to rotate the bullet to find a sweet spot. If there is one, I suppose you could mark the bullet with an "up" position.
They say you can lubricate the o-rings with gun oil, but I am going to try a better idea. I once used petroleum jelly on o-rings and had them swell up to an out-of-spec, unusable condition. The right lubricant for that was silicone based, so I will try it on a laser bullet.