When can we retire?

My husband and I have 1 house paid off and 1 million saved, we have no debt, we are in our 30s, no kids, when can we retire? We have checked online but not much data or formula apply to our situation. Most of our savings are in 401k which can’t really withdraw until 59.5. We don’t like to withdraw with penalty so we will keep those in investment. Anyone know of any site or place can provide us feedback on when we can retire?

PS we have seen financial advisors at the bank but they tried to sell us products so we didn’t really like to use them.