I didn't test for a year elapsed time, but I tested 1 shape of votive, 3 scents, for 3 months. However, that was working 40 hours a week on them, so that was about 160 hours of testing per scent. That included figuring out and taming a new wax, the wicking and burn tests, all the way down to the end of the candle tests, marathon burn tests, throw tests, coloring, packaging & labeling, shelf life.... It can take a long time to burn a candle all the way down to the bottom. One of the reasons I started with votives After I got those down, the amount of testing dropped considerably for each scent because I had the experience to know how a test should look. I only needed to test a couple of wicks for each scent, and didn't always burn down to the bottom. However, every time I got in a new batch of wax, wicks, or fragrance, I'd do a full test to make sure nothing changed.