One of the most commonly asked questions on Carisoprodol is How long does soma stay in your system?. The action of the analgesc along with its elimination largely depends on the half-life of the person. The process of elimination of Carsioprodol take place in the kidney and takes about 24 to 48 hours to completely remove it from the body. However, it can be detected in the urine and hair for a much longer period of time.