How Long Should I Change the Filter for My Air Purifier

How can I Set the Air Purifier to Run for 12 Hours

I can only see the 2h/4h/8h option on the control panel.

What Kind of Plug Does the Air Purifier Have

Will Purivortex Air Purifiers Remove the Smell of Smoking, VOCs and Odors

Can I Run the Air Purifier 24/7 Continuously Without the Timer Shutting It Off