In this state the muscles of your hips and legs are not working, and therefore energy is not needed. However, when you stand up to take a break, the muscles used to stand and walk will need the energy contained in ATP to do the work. The length of time the stored energy will last depends of a number of factors. Whatever the circumstances, the ATP-CP energy system does not last for very long. The metabolic process of the lactic acid system is call glycolysis.
Glycolysis is an enzymatic process found in all cells.
It is a process whereby glucose goes through 10 separate enzymatic breakdowns. During the process there is a net re-synthesis of 2 ATP for every one glucose molecule broken down. As previously stated, the lactic acid system does not last very long. It does, however, last longer than the ATP-CP system. The lactic acid system will last anywhere from 10 to 180 seconds, depending on a number of factors.