The instructions for mills() specifically state that mills returns the number of milliseconds since the program started. millis() - Arduino Reference
I have been over the blink without delay tutorial several time and yes, I am still trying to figure it out. That would be why I am asking for help. The reason for the double post was to find someone that would be willing to help me get a better understanding of the code than just simply tell me to look at a tutorial.
My question is not silly, it is a valid question. If mills() returns the time that program has been running, how to I increment the counter so that I know when 90,000 milliseconds has passed?