No idea, but lots of actors come out after matinees on two-show days, which is basically the same thing as this. So I wouldn't assume just because they have the 10:00 show that they won't come out.
"No idea, but lots of actors come out after matinees on two-show days, which is basically the same thing as this."
Only if you ignore that those actors are coming out with a 2-ish+ hour break between shows, and NPH has less than 90 minutes from finishing the first show, in costume, before having to do it all again... there's no comparison between that, and an actor getting out at around 5pm, and having to get back to the theater before 7, so they have an hour or so to get back into costume, and prepare for their second show.
I agree there's a difference, but they still have an hour between the end of show one and half hour call for show two. I'm not saying they do come out, just that we shouldn't assume they don't.
There is no "policy" nor could there be but there is common sense that there is not enough time to do anything during the short break. And in particular, if NPH came out he would just be assaulted by people who want him to sign their playbill or whatever. Does that seem like a logical way to rest between two incredibly strenuous performances?