True.
In my opinion you need to run a dashcam for a year at least to determine if it have a chance of fulfilling its role, i would guesstimate that 3 hour recording every day on average is fair to expect, and a winter period of 3 months where the camera get exposed to 0 Deg C or lower temperatures, and a simmilar summer period where a camera get exposed to the 70-80 Deg C inside car temperatures every day.
This however is a lengthy process that i am not sure if dashcam makers run on ther models, at least not for a real 365 day period, or a simulated shortet time with 2-3 "days" every 24 hour.
I think most extrapolate what the camera can do based on component specs, and then a shortet test period in closed test closet where extremes can be simulated.