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When I built my kitchen cabinets, I used 22" full extension slides rated to 150 lbs. My drawers are about 30" wide, and one holds a couple cases of soda, so I went overboard on the weight capacity. My cabinets are face frames with inset drawer fronts, so I needed slides that would fit in a 23" deep carcass. I didn't do it, but you could build your drawers longer than the length of the slide. The overage wouldn't fully extend, but you'd get the additional storage. With my application, the slide extends the full 22", but since it's they are inside the 3/4" face frames, I still have a little of the drawer inside the carcass when fully extended.
The length depends on two things--the depth of the cabinet and the type of slide. Some slides fasten to the back of the cabinet, others to the sides. Usually one uses the longest slide that will fit in the cabinet.