Product review (4 stars): Fine for Emergency Ice Needs
After delivery, I allowed the unit to sit undisturbed on a countertop overnight per instructions.  The next morning I filled the water tank and turned it on.  While I did not put a timer on it, I'd estimate that the first ice was produced in 15-minutes and then more added every 10-minutes thereafter.  The machine makes what I call ice "bullets" in that they are bullet shaped, and hollow point at that.  We have noted the ice is soft, not hard cubes like your refrigerator makes, and does not last as long in an iced drink. But as a means to create emergency ice in the middle of a gathering, it's great. We bought to use on our RV, will update as we have more experience with the units ability to stand up to camping stress.
Update: have used almost a year on our motorhome. The unit performs well and can fill an ice bucket in a couple hours under right conditions. By " right conditions", the unit needs to be situated indoors, preferably in air conditioning. Using it outdoors on a warm/hot day significantly impacts production and retention of ice.