maximillianos - 4:27 pm on Sep 27, 2011 (gmt 0)
I think you are okay if it has only been 24 hrs. Of course it depends on the size of your site, and how often G crawls your pages, but typically they take canonical tags as a suggestion. They are aware folks may make mistakes with it.
Of course they said that about on-site duplicate content years ago... and we all know what happened earlier this year. =)