metals that retain a high order of ductility and resistance to brittle fracture down. to very low temperatures, and a much larger class of metals that, at some temperature. or in some range of temperature, undergo a transition from ductile to brittle.behavior. As pointed out above, the temperature level where this transition in fracture behavior. occurs is influenced by the test conditions.
If you are a moderate vaper, whereby you vape fairly consistently through most of the day, but only take a couple drags each time, your coils should last you about 14 days or so. If you are a very light vaper, where you take a few hits here and there throughout the day, your coil could last you 3 weeks or so.
As of yesterday I had some PP I smoked on the 18th of Sept. for a party. I've been eating on it since;I had about 3-4lbs. left and I finally bagged it in vacume bags and froze it in 1/2lb. packs. Now it will last,actually I don't know how long it will last as I will eat it before it can get there. But back to the question,mine lasted 13 days and is still good.