hard time

I am a salesman. I'm selling electronic component. In short, I'm selling IC to my customer. I can not say that is a nice job. But I can believe that I could earn a lot of money in the future. This year is a hard time for me. I have to study at weekend and work hard in week day. I almost no time to take rest. I hope summer vacation coming. Otherwise I will die because I have to tired from working