The effects of chlorine gas can vary depending on the concentration of the gas and the duration of exposure. At low concentrations, chlorine gas can cause irritation to the eyes, nose, and throat, as well as coughing and difficulty breathing. At higher concentrations, chlorine gas can cause more severe respiratory problems, such as chemical pneumonitis, which is an inflammation of the lungs. In severe cases, chlorine gas can also be fatal.

The time it takes for chlorine gas to take effect can also vary depending on the individual's health and sensitivity to the gas. For example, people with asthma or other respiratory conditions may be more susceptible to the effects of chlorine gas.

It is important to note that chlorine gas is a highly toxic gas and can be fatal if not treated promptly. If you are exposed to chlorine gas, it is important to seek medical attention immediately.