Over time, they have modified their generators to run for a maximum time of 30 minutes for one application. In most situations, this will clean and disinfect your gear. If smells are more ingrained in the fabrics or materials, you may need to use the generator for more than one cycle. Scent Crusher strongly recommend that you allow the unit to remain undisturbed for an amount of time equal to the run time prior to opening and then allowing fresh air to be exposed to your material, before beginning another cycle. This process will reduce some of the potential impacts on the materials.