I have to disagree with Ryan. 2 terms isn't max length URL can have. Always use as many characters in URL as it's necessary. There is no anything like "very long domain".
For example: minnnepolismassageandfitness.com will give you more domain SEO juice than minnnepolismassage.com
If you are concerned on search engine visits, use whole keyword in your domain. It will be easier to rank for keyword. But if you wish to receive direct visits (which I doubt), use user-friendly domains, keep it short and nice looking.
