The bubbles last for quite a few hours. Note that they are tiny bubbles and they stick together like massive and light foam body in a sealed cavity. This way they will not burst easily as in the case of large bubbles and of being exposed in open air.
The bubble generator needs to be operated only for a few minutes with fan for air and pump for soap liquid. This means that the bubble generator is designed to fill the entire double-layer cavity in just a few minutes. As a rule of thumb, the soap liquid expands 1000 times in foam bubble form.
Watch this video and see how fast and how much bubble foam that can be produced:
