It depends on several factors, such as the equipment used and the company. However, it takes about 20 to 30 minutes to pump an average-size septic tank of 1,000 gallons. A larger tank that is over 1,500 gallons can take up to an hour to pump as long as there are no complications. 

A few signs can indicate that your cesspool needs to be emptied outside of its typical schedule. An unpleasant odor coming from your pipes or near the cesspool, gurgling noises in your pipes, and uncharacteristically good growth in your yard are signs of cesspool problems that suggest build-up or overflow. If your pipes back up, you should have your cesspool looked at right away.

A septic smell may be harmful because sewer gas is dangerous depending on the exposure amount and length of time. Sewer gas is made up of multiple gases, including hydrogen sulfide, methane, ammonia, and carbon dioxide. Some of these gases, like hydrogen sulfide and ammonia, are toxic to humans and can be fatal in high concentrations or long exposures.

It is not normal to smell your septic outside and indicates a problem such as an unsealed manhole or access lid, a clogged septic line, a faulty vent stack, or the need for a septic tank pumping. If sewage is leaking from your septic system, it can be hazardous to you, your family, pets, and the surrounding environment. You can troubleshoot the issue yourself, or contact a septic tank pro who can resolve the issue quickly.