Customers stand in line at 8am on a Saturday at Snow’s BBQ In Lexington. (Photo ©Gary Jacobson/Texas BBQ Posse) Eureka experiences are not uncommon in barbecue. Usually they have something to do with the food. My most recent BBQ “a-ha,” though, had nothing to do with great brisket or ribs and everything to do with time. Waiting time. Living in Austin, I just discovered, it’s actually faster to eat at Snow’s BBQ in Lexington than Franklin Barbecue in Austin, even though it involves a 100-mile roundtrip drive. My home is about three miles from Franklin and 50 miles from Snow’s,…