Firstly, I think it's 18 months - I haven't actually checked in years. Secondly, 12 months isn't more sensible, because of the inconsistency in the number of Tests played each year. In the long run, the big teams play a similar number of Tests to each other (these days, at least), but over a period as short as a year, there is big variation.
no subject
Date: 2007-09-08 10:43 am (UTC)