The longest I have gone without a shower was 19 days during a field exercise in the army. With only 2 changes of clothes, things got pretty sticky.:disgust:
The one good aspect of it was that with being with 90 or so other people who also didn't shower, you kind of got used to the odor. After the first few days, the only time I really noticed it was when I first got home and I walked into a fresh smelling house. It was like a miasma of funk followed me through the door. My wife came to give me a hug to welcome me home, but she got within 6-7 feet of me and turned and walked the other way, saying that I wouldn't so much as see her until I took a shower.
Let me tell you, there's nothing quite like the feeling of having to peel your underwear off of yourself. Yeech! I think I ended up throwing those clothes out, IIRC.