What are the size limitations or concrete counter tops?
This is often a debatable topic among contractors but generally speaking, slabs should not exceed around 8′ x 3′. Oversized slabs are usually hard to work with and are also more likely to crack. This just means that for large applications seams may be required but they can become a very attractive element of the design. If you have a large area requirement, cast in place may be an option that will offer the size you need, without the requirement for moving the slab.