Do they stay warm the full 18 hours (assuming 32 deg F ambient)? If not, how long?

I've used them for years and have always found them to work at least 12+ hours. Primary use has been in my sleeping bag when it's better 30°-40°F. Definitely a good buy in my opinion.

What is the typical expiration date? I bought this in January 2013.

The ones that I bought in April 2013 have an expiration date printed on them of Nov. of 2017. If you look at the description of the 'Hothands 40 Count' here on Amazon, it says "individually sealed in airtight packages to guarantee a shelf life of six years." I don't know personally how true that would be, because I use them all within months of getting them, but you could go to the Hothands website (Hothands.com) and see if they have any more info.. Hope this helps!

Size	40 Pack
Brand	HotHands
Recommended Uses For Product	Camping
Reusability	Single Use
Upper Temperature Rating	160 Degrees Fahrenheit
Manufacturer	HotHands
UPC	094733152433
Global Trade Identification Number	00094733152433
Item Package Dimensions L x W x H	9.76 x 7.24 x 6.54 inches
Package Weight	2.76 Kilograms
Item Dimensions LxWxH	13 x 5 x 4 inches
Item Weight	4.7 Pounds
Brand Name	HotHands
Model Name	HH1ED240E
Suggested Users	unisex-adult
Number of Items	1
Part Number	HH-1
Style	Super Warmers
Sport Type	Camping & Hiking

HotHands

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