How long is too long for advisor to not read my manuscript?

[egFace]

I worked very hard on a set of experiments that took a very long time. I wrote a manuscript detailing the results of the experiments and sent it to my advisor exactly 1 month ago. I didn't get a reply, so I sent a follow-up email a couple of weeks later. I still haven't received a reply, and I sent an additional follow-up email today. I am his only grad student, and he does not have any postdocs. He teaches one course. I feel like he should have time to read my manuscript (which is a brief communications paper, so it isn't even that long), and I am frustrated. How long is too long for an advisor not to read or reply to my request to read my manuscript? By the way, his name is on it so he has good incentive. 

[Dario8018]

Since you sat it's only a brief communications paper I think it should not take him more than 1 week. In my case, when I was in a hurry to get feedback from my advisor I used to give him a call.