The process I've followed is a bit more than that...as the initial seasoning is to heat, oil, cool, wipe and repeat several times...it takes a few hours.

My former roommate seasoned first with salt (heat to a scorch with a cup of salt, constantly stirring over flame for 20-30 minutes) and then repeated the oil treatment a couple of times. His method produced the very dark color immediately.

To clean, it really only takes water to rinse and a light brushing...then heat dry on stove...then re-oil and let cool.