sun screen does not work for SEVEN HOURS derp
Sunblock works for 2 hours. Not 7. I never get sunburned, I just get a lock of dark freckles if I don't wear sunblock.
You're both Idiots. It depends what SPF it is. spf is how many times longer you can stay in the sun. so spf 30 is 30x longer.
There's your simplified version.
Besides which, you're an idiot. If memory serves, SPF is the amount of protection from the sun you get.
Which would make it "Sun Protection Factor".
After I wrote that, I looked it up on
Wikipedia.