As a detailer, I have been using this on multiple customer vehicles, many daily driven and constantly exposed outdoors to the elements. Applied dry on prepped paint will last 6-8 months and much longer if the vehicle is garage-kept.
On the downside, it can be a little difficult to buff out streaks if you apply too much, especially in direct sun. A little goes a long way and a bottle can get you through 12+ car applications. Excellent product and overall value.