Last year I had just one kit and it was fine, I washed it every 3-4 days in a hotel sink/shower.
My main concern was an infection caused by saddle sores so whenever I had a shower I cleaned that area really really well. I also had anti-bacterial cream which I probably applied twice a day.
Dumb question... I always imagined people took 2nd sets of clothing or something.
Is this just a "ride and sweat, and stink like a packhorse, and just have a shower at the end where fresh clothes will be waiting" thing?