How long would you keep this Caesar dressing?
I make a nearly identical recipe for caesar dressing, and have safely used leftover dressing up to a week later. I can't vouch for any "technical" food spoilage rates, only that my friends, family, and I have never gotten sick from eating salad with dressing in this age range.

I can't speak to anything longer than that, as the dressing never seems to last that long!

As a closing note: if you are in doubt, don't eat it!