How long does a 250G gel last?

Lifespan depends on cabin temperature and ventilation. In normal driving conditions with windows closed, expect several weeks of consistent scent output before the gel is depleted.

Will this stain my cup holder or interior?

Gel formula is designed not to leak or drip. Place it on a flat surface away from direct sunlight and heat vents. If the cabin gets extremely hot, keep the gel in its original packaging to avoid any potential mess.

Can I use this with the windows down or air conditioning on?

Yes. Fresh air circulation will distribute the scent throughout the cabin, though it may shorten the effective lifespan. For maximum longevity, use with climate control running on recirculate mode during the cooler months.