Comment by fvox13

Should be reasonably painless. You'll want to read the release notes for 1.3, 1.4, and 1.5, because there are a couple of things that have been deprecated and/or removed. And even a few things that have moved but are otherwise the same. I would think that a day would be sufficient for most peoples' uses of Django. I upgraded from 1.2 to 1.5 a few months ago, and it only took an hour (and this was 10 sites worth of code).