Over the summer i did 33 days cycling around europe, 100 miles a day (on average)
As i was wild camping most of the time I had 5 showers the whole time and didn't wash my two pairs of cycling shorts, 1 cycling top and 5 pairs of socks at all. I often slept in my cycling kit. shit got nasty real quick.
My brother wore the same clothes for a month without taking them off when he was trekking through afghanistan. he said it was so cold that he didn't dare take off his clothes. He had a 5* hotel waiting for him once he finished so it wasn't all bad.