Home to light rail: 4.15 miles. Light rail to home: 5.33 miles (slightly different route). Work to home 2x/week: 18-21 miles depending on the route I take.
Elevation gain is the bigger factor: home to light rail, 13 feet. Light rail to home, 640 feet. Work to home 2x/week, 900 to 2200 feet depending on the route.