Why does the CoolSmooth take two hours instead of one hour like the original CoolSculpting applicators? Does it not get as cold?

You ask a very interesting question. To give you some historical context. Coolsculpting was invented by two Harvard dermatologists. I had the good fortunate to be a resident at the time the initial research into Coolsculpting was done at Massachusetts General Hospital. The Coolsmooth applicator actually closely resembles the prototype research device that was used to study the procedure. The other applicators use a vacuum to pull the fat into a hand piece where it can be cooled from both sides of the hand piece so the cooling can be achieved faster than with a flat applicator like the Coolsmooth applicator. To obtain the clinical result, the cooling cycle needs to be longer with the Coolsmooth applicator. 

The concept behind all the suction based applicators is that when fat is drawn into the applicator, it is isolated from the muscle, blood supply and heat, therefore, making it faster to freeze. With the CoolSmooth applicator however, the fat tissue is not isolated. The closer it is to a heat source, the longer it will take to freeze. The extra hour makes up for the fat cells not being isolated, allowing enough time for the cells to become crystalized and damaged.