10 bags @ 9.6 oz each = 96 oz = 6#
I think it may last me through the end of the year as much as I like them, I don't sit down with a bag in front of me to eat. I usually grab a handful 1x-2x a day and some days go without.
My wife brought me home two small Tabasco chocolate bars from when she was in New Orleans. I will have to try them to see how they compare to these M&M's from a "heat" perspective. I find the M&M's to just have a touch of heat.