The dressing contains raw eggs, olive oil, lemon juice, garlic, Worcestershire, mustard, salt and pepper. How long can I keep it in the fridge in a airtight container?
Up to 7 days (homemade mayo as well). Egg whites/yolks out of the egg (but not combined with the acid) can last 3-4 days refrigerated, and eggs in-shell are good for 2-4 weeks depending on processing.
Hmmm. It's the eggs that have the potential to cause problems. I'd say less than a week, or until the acid kills the egg, and causes the whole thing to de-emulsify.
You can age raw eggs by keeping them in the fridge for 3 days, so I would definitely say more than 3 days, but less than a week. I think the dressing would develop a bad consistency or start to taste too strong before it actually spoiled.