>Seconds are allowed.
The train that used to follow the Frazier River part of the way from Vancouver to Dawson Creek made a meal stop at a logging camp. I was a young lad and was amazed to see the quantity of food the loggers were able to put away and go right out to work.
This was in the day when chainsaws were new and heavy and much of the work was still done with single and double buck crosscut saws.
https://www.fs.usda.gov/t-d/pubs/htmlpubs/htm06672804/page05.htm
My Dad guessed they ate about 3,000-3,500 calories at breakfast.