You're certainly entitled to that opinion, but the amount of time that is "acceptable" is completely subjective and relative. Holding someone else to your own arbitrary standards of acceptability is exactly what I'm referring to when I say these sort of complaints usually ignore the possibility that someone else's life is different than one's own.

I can see how a month would seem like a long time, it used to seem like a long time for me too. But for someone running a company, someone with a crazy family life, someone maintaining several projects, someone getting married or divorced or having kids, someone buying a house or selling a house or moving, someone in school, someone having financial troubles, etc., etc.; a month can be a blink of an eye. You, of course, are welcome to your opinion. I try to avoid holding people for whom I know nothing about to my own arbitrary standards, and try to withhold indignation if they don't live up to them. I admit it takes effort; I often find myself doing exactly that. I just have to remind myself that I can't really know them to the extent that I know myself, and thus it's not always fair to expect that their situation lends itself to meeting my standards.

EDIT: All that being said, I think the pull request hack could be a potential solution. It does however bring its own potential problems. You're basically putting your reputation in someone else's hands, whom you don't know. Of course that may be preferable to what you're doing to your reputation by taking a long time to respond to requests. I'm certainly considering it for a couple projects.