? That sounds to me like one load every week, which I am having a hard time reconciling with your previous phrasing “wash and dry two loads once a week”, but you know what? It doesn’t matter!! I refuse to let this fleeting cognitive dissonance about the details of a complete stranger’s private laundry habits obsess me! Use your laundry room in good health HOWEVER often you do or don’t! All good!! 
Whites and coloreds. I go through a lot of white socks and undershirts.