Originally Posted by
WobblyPop
what do you measure time in?
Read what you wrote. You claimed SPF 30 protects for 30 minutes.
It protects 30 times of whatever the normal time is. If a normal time is 10 minutes (depends on your skin, clouds, altitude etc) it will be 300 minutes of protection. It is a factor, not a time. That is the F in the name.