Miker,
I do caution against leaving wine and lees in still contact too long (more than three months and the wine enters a danger zone caused by dead yeast cells breaking down). But I also say on the same page that you can leave wine on the lees long past that time if you stir the lees every week or so.
I also say on that page that it is not necessary that the interval between rackings be 30 days, 45 days or 60 days, but it should not be less than three weeks. I stand by that, even though many of my recipes say to rack the wine every 30 days, 45 days, or 60 days until no new sediment forms during the next interval. The reason for the seeming inconsistency is that the recipes are written for those who have not yet graduated from cook to chef. Cooks follow recipes. Chefs create them.
If you need a recipe, then follow it. Once you start making wine from knowledge rather than rote, you will rack when you think the wine needs it. Even beginners can do this, but they tend to make mistakes when they first start beinging independent. That's okay too. We've all made plenty of mistakes.
Jack Keller, The Winemaking Home Page
formatting link