He is a lucky guy...

Back to the original question... I am sure your marriage vows did not obligate you to run marathons without proper training and on a short notice whenever your H so desires. Nightly sex for an hour after a two hour long commute is more like marathon than like conjugal love making. So no, you should not have any obligation to perform, in anybody's book.

Plus, I do not see the point in his weaning himself off porn. Who would benefit from it?

I thought that love making is better than masturbation to porn because it connects two human beings. Per your report, there is no connection for either of you. It is completely mechanical. So, it is in no way better than porn. Let him masturbate and use the benefit of an extra hour of sleep for yourself. You need that hour, with your kind of schedue.