How long to wait before judging changes?

[tvfoodmaps]

After making SEO focused changes (adding/removing internal links, changing nofollow attributes, changing titles, etc) how long should I wait to "judge" the effects of those changes on my ranking?

[Linda-Vassily]

Have your page come up in a search (you can always search for the url) and hover over it. Arrows will appear to the right of the result. Hover over them, and a preview of the cached copy will appear. Click on the word "cached" and it will bring up the cached version of the page, with a date at the top. (This works slightly differently in different browsers I have seen, but something like this will bring up the cache.) http://www.googleguide.com/cached_pages.html

[tvfoodmaps]

Hi,  I'm not seeing the date of the cached copy in the search results, where do you find it?

[Linda-Vassily]

I usually wait until the pages that I made changes to are crawled again. I determine this by looking at the date of Google's cached copy.