For eight years it was 37km/23mi total, but the last two years it has been a little over 26km/16mi.
I am riding a city/gravel bicycle (Malvern Star Oppy S2), which weighs around 22-23kg (50lbs) in the morning and a kilogram-two (3-4lbs) less on the way back home (food gets transferred from bicycle to a better, and more appropriate, place, which is my stomach).