Whenever I start a broad look at "change your life" or transformational practices (from work habits to diet, to exercise, etc), I always come across the "90 day" gambit.

Take a look:

Working Smart 

Habit of Health

Government studies ( you need to look halfway down page) - A number of studies have shown that treatment effects on recidivism do not appear before about 90 days of treatment, and that treatment effects improve with time in treatment ( Hubbard et al., 1989; Simpson, 1981, 1984). Time in treatment, whether in the institution or in the community, is a critical factor.

What do other people think about this?  When you attempt to learn a new skill, or change in some way, do you follow the 90 day rule?  Do you believe this is simply a convention?

This is silly, but at lunch, I ran across this "googlefight" site (I ran across this site, while doing some learning research, and decided to input my own subjects.  Really - I know you are going, "sure you were" but it's true.).

Also, Scooby-doo beats down Snoopy. 

I always liked Scooby-doo better.