For how long can I wear the filters?

According to the manufacturer, you may wear the filter continuously for up to 24 hours. Some user reportedly do both outdoor and indoor everyday activities while using the filters without facing any issues. Officially, we suggest that you use them only when you have to (as is the case with dust masks), for example outdoors during days with heavy paritculate pollution.
You shoud be always cautious when first using the filters, and wear them only for limited time (15  minutes) during your first application before gradually increasing the time that you wear them, once you realize that the are no negative effects occuring from their use.