Having set myself the goal of knitting Fred a sweater before December 25th, I thought it a good idea to consult an expert to see whether or not my goal was at all possible.
My favourite expert is Elizabeth Zimmermann. In her Knitter's Almanac she knits an entire adult sweater between December 1 and December 16.
Presuming she counted both the first and the 16th, she knit for 16 days. Exactly the number of days available to knit Fred's sweater. No extra math calculation needed there.
But Elizabeth's sweater was knit at a gauge of 10 stitches over 4 inches. Mine is 20. By my knitters math, that will double my time. 32 days. Hmmm - not good.
Reading further, Elizabeth states she knit on the sweater for 30 minutes per day. If I double the time not the days and knit for 60 minutes per day, I should be back on track for the 16 day sweater.
However!! Elizabeth knit a 46 inch sweater. I am knitting a 48 inch sweater. Using my calculator here because this is a high level of math for this knitter, I ask my self "How much extra knitting time does that two inches require.?"
The two inches - again by Brenda's math which is often not perfect - amounts to 4.347% more knitting. If I calculate that in terms of days I would need to knit for 16 . 695 days. In real terms I think that means knit all night Christmas Eve. Not going to happen.
Recalculate. Multiply that 4.347% times the minutes per day, to find out if I will be able to eat or sleep. BUT - do I multiply by Elizabeth's 30 minutes or my 60 minutes. I think the 30 might be wishful thinking - a pre-Christmas prerogative, but still. Better to multiply 4.347% times 60. 62 . 608 minutes per day.
And to that I say HAH!!!
I started Thursday evening and by Sunday evening had this finished.
By my calculations - one sixth of the sweater. Four evenings equals one sixth. That is, by my count, 24 evenings. What do they call that Christmas that comes on January 6th?