How often should a marathoner do a long run?

Obviously, there are different needs for diff runners. But a serious marathoner who does 15, 18, 22 over three weeks for their long runs, is that too much? A recreational runner, someone who wants to break four hours, what are their normal long runs like? I am considering a story on this one, so send us your opinions!

Larry Eder
Publisher
Cal Track & Running News