Calibrating can take anywhere from one to four hours. Changing one thing affects others so there is a lot of back and forth to get it right.
Here's your school house:
AVSForum Calibration - read the stickies
ChromaPure - watch the Demos and read the Color Science section
If you buy ChromaPure, the help sections are excellent.
and Colour Calibration For Dummies
I charge friends a bottle of wine. I'm not in it for the money.