BTU's

I have about three columns of firewood left in the back. I get about three loads of wood into our wood stacker next to the stove. Each stack lasts about four days. That means there are about 12 days of wood in each column. I have about a 36 day supply of wood remaining. Looks like we have enough wood left to get us through April 23rd. That should be enough.
Time is not always measured in minutes or hours. Sometimes in the north country it's measured in BTU's.