Bounce Houses, water slides, and obstacle courses come in different shapes and sizes, therefore each unit has its recommended blower. While regular commercial bounce houses can inflate within as little as 2-3 minutes this time can easily double on big water slides and obstacle courses. The blower provides continuous airflow during operation and can’t be turned off. Giant commercial bounce houses may have more than 1 blower. Some older combo units may require more power and additional blower as they get older. So how long it takes to blow up a bounce house depend on size and age of an inflatable.