http://groups.csail.mit.edu/mac/users/rauch/worktime/hours_w...
Does not sound like the actions of a group desperate for more work.
You could also cross bodies of water over the ice much easier with cattle or heavy loads (like wood, big game meat etc).
The core topic is "vacation", the concept of pleasurably not working while using reserves for sustenance. This in contrast primarily with "work" (the process of labor to create sustenance & reserves thereof), and raising the side contrast of "unemployment" (unable to produce sustenance, eating into reserves - or facing the prospect of none - in a decidedly UN-pleasurable situation).
Today we conflate "work" with "payment", as our society has become advanced enough that few indeed need produce the actual essentials of sustenance (ex.: by sitting here thinking for 8 hours, I can produce enough value to trade for a week's essentials - much more productive than simple gardening). The money (now mostly mere etherial bits, tacit agreements of trade) we earn should not obscure the fact that we're working for essential sustenance, plus surplus.
I grew up in a family which engaged in significant (though not complete) self-sufficiency. Heat? cut down trees, split logs, used wood stove. Food? grew half a year's vegetables & fruit. Clothing? made some of it, repaired much. That all wasn't "not working" just because a wage wasn't involved; it was hard work, not a vacation (and not unemployment).
The point was that if the people had employment opportunities, they'd be less likely to die from their own crops failing, either through acquiring savings during downtime to pay for food or being able to move out of farming when the crops failed. I mean, the seasonal pattern of agricultural labour still exists for millions in many developing countries, but none of them have any shortage of people who used to work on the land seeking work in their sweatshops.