I have an Omron C28p nebuliser. Only about £45 but so quick. 5 mins if just albut ordered new masks in the summer and went for some Philips Side Stream as they came in a multi pack. Oh my word they are so slow. It's definitely the container mechanism, not the tubing, as experimenting proved that. 30 mins. So frustrating.
However, I've now received my new Omron neb kit and I love my nebuliser once again!! (I really would rather not want to love a nebuliser but having to use it 4 hourly in the daytime I want one that's quick!)
I realise my post has no point to it other, perhaps, than me recommending the Omron nebuliser with its own masks!