In Massachusetts, you can defer serving for up to one year, just check off the box and the date you're defering to.
There are also NO excuses here. The Judge does ask if there is any reason why you can't be bias while serving, or is there any reason you can't serve for X amount of days, (I'm on vacation doesn't count, which I found out when I had to give up 3 vacation days). At that point, you can raise your hand, and they let you go--- but you go back to the jury pool and you go to another case... I suppose you can keep saying you're not bias and eventually they'll let you out.
Last summer, I had to serve, I figured it would be just as easy to serve and get it over with... the case I was on should have been only 1/2 day, the lawyers dragged it out to 3 days UGH... But now I don't have to serve for at least another 2 years! I know it's my civic duty, sometimes it was interesting, sometimes it was boring!! I personally couldn't wait to get it over with... I suppose if I wasn't on vacation, it may have been different. But you know, there are SO many people out there that WANT to serve, my Mom for one, she never gets called and wants to serve so bad!!
Just don't defer to a "slow" time like during the summer when a lot of people are gone, because the people who do show up, are most likely going to be called.