My understanding from Pari is that the ProNeb Max takes the least time then the Vios and then the Trek. But I do not think it should take that long. If you call Pari they will send you another one and have you send back the one you have. I was having issues but discovered it was the sprint cups that were making it take so long. Also from what I understand you cannot use Mesh nebulizers with saline. However the Omron mesh does say it will work with saline. If I use the ProNeb it goes pretty fast with just saline (10 minutes or so).