Many drain cleaning companies make false promises of unclogging drain pipes in an hour or less. The time needed for unclogging drains depends on various factors like the company size, the service area, and their in-house infrastructure. Reputable companies like Dima Plumbing, your 24/7 plumber, offer an accurate response time of within half an hour. One or two hours are enough to resolve most plumbing services. However, the industry norm is to give advanced notice to the client in case of a delay. The time required mostly depends on travel time. So it’s better to verify if you are in the company's service area. The chances of a quick response are higher if you are. If not, you may have to wait a little longer for them to respond to your call.