It was depending on the circonstances :
at draft physical examinations, it lasted for almost all a morning to be undressed until nudity
at middle and high school physical, at least one and half hour, sometimes two hours in a locker room just in briefs without socks under supervision of a male PE teacher and after about 15 minutes in the exam room being naked in front of the female doctor, the female school nurse and sometimes a girl nursing student who did a training course at school ( even if it was a boy's only school , she could be lucky to have been assigned at that school !)
at a doctor office no more than 10 minutes undressed rather in briefs and for a short while naked ) or at job physical examinations in the 70 and 80, it could be 15 minutes undressed in briefs or seldomly naked if thre was a small cabin with a mention to strip complertely which could happen
"scotty95"
The longest period would have been at my group physicals at school where I was stripped down to my boxers for the best part of an hour, with all the waiting around between stations. Actually nude, it would have been less than five minutes while they did the hernia check and had a look at my genitals.
As a horny teen I got erect most of the time, especially if girls had seen me in the corridor to the gym only wearing my boxers on the way to my exam.
Why if the group physicals were separated for girls and boys you could be seen in just underwears in corridors on the way to exams by girls, why would they wxalk in that corridor , it might have been forbidden that day ? Ho old were you and them ?
was the reverse possible with boys seeing girls in just panties in the corridor ?