Last year with the old PARI Vios green and old LC Sprint, it took about 7 min to nebulize 4ml of 7%. Over time, the old Vios slowed down considerably and PARI sent me a new one. Also, I compared the recent Sprint cup design to my old one of last year and they are different. I first thought the slower nebulizer time (about 20 min) was due to the cup, but then I tried my old Sprint cup and it was still slow, so I called PARI and they sent me a new Vios. It only improved the time from 20 min to 14 minutes with the new Sprint cup. (I don't have any more old cups.)