Most manufacturers indicate the vacating period on packages to inform consumers of how long to stay out of house after bug bombing. Most of them require you to stay out for around 2-4 hours. This time is enough for the fog to settle down, and for most pesticides, the air will be clear of the smell in case it is not odorless. If you are planning to go for a vacation, then it’s the best time to set the flea bombs since you should always ensure your family is safe and that they can be out of the house during the stipulated time.