How long does one box last?

Gel fresheners hold scent longer than liquids, but duration depends on climate, ventilation, and how strong you like your cabin to smell. Expect several weeks of noticeable freshness before you'll want a replacement.

Can I use both chambers at the same time or just one?

Both. The 2-in-1 design lets you open one chamber for lighter scent or both for stronger coverage. You control intensity based on your preference and your car's size.

Where should I place this in my vehicle?

Cup holder is the easiest spot for even air circulation. Under-seat placement works too if you want subtle scent. Avoid direct sunlight on the dash, which can dry out the gel faster than normal.