I have been using my Airpurifier continuously for 1 month now. It runs on the "automatic" level. It cleans if necessary (e.g. when cooking, vacuuming or when the windows are open). Now it still has 82% of the filter capacity left.

When I smoke a cigar in my small room, the unit runs for about 1 day until the air purification is 'through'. Then I switch the device off again. I have found out that just under 2% of the filter is wasted per cigar.

The filter measures this itself and the app displays how many days or percentages are left. Up to about 6 months should not be a problem. Replacement filters are available from the Chinese for <40 CHF.