Do you simmer stew with lid on or off?

Online Answer
Better to Simmer Covered or Uncovered? Because simmering is something that needs some supervision, it's best to keep the lid off of the pot until you're sure that the heat is steady.
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It also helps in tenderizing meats, which is an added advantage while preparing delectable dishes out of inexpensive, tough meats. Disadvantages of simmering are that it is a time consuming process as compared to boiling, and excessive simmering can destroy the nutrients present in the food..
As verbs the difference between saute and simmer is that saute is while simmer is to cook or undergo heating slowly at or below the boiling point..
Always cover your pot if you're trying to keep the heat in. That means that if you're trying to bring something to a simmer or a boil—a pot of water for cooking pasta or blanching vegetables, a batch of soup, or a sauce—put that lid on to save time and energy.
Spaghetti sauce usually has additional ingredients and spices like onion, fennel, parsley, and oregano. PRO TIP: Simmering a spaghetti sauce for a long time allows it to develop a lot of flavor..
Four hours is the limit for the "danger zone" not 2, so you should be fine right there as you'll only be gone 4 hours. What I would do is crank the heat before you leave, let it come to a boil and then turn it off and throw a lid on it.