I'll have to start on its twin tomorrow. This one took me 3 days (maybe 13 / 14 hours). I'm not sure if the next one will take longer because my motivation will drop a little (I already know how it's going to turn out) or will it take less time because I know what I'm doing.
And for future reference (more for myself than anything else), the pattern*.
starting at the back (at the top of the arm)
cast on 18 stitches (for chunky wool)
seed stitch for 4 rows
k1, p1
p1, k1
switch colour (this counts as a row)
knit for 8 rows
switch colour
knit for 8 rows
do this 2 more times for 4 knitted rows of stripes (you have 5 stripes all together by now)
knit for 7 rows
on 8th row cast up 5
on 9th row cast up 5 on the other side (so it makes a kind of T)
knit for 8 rows (not sure if you count the cast on, or not)
cast off the T over 2 rows
switch colour (this may not count as a row)
knit 4 rows (casting off 2 stitches somewhere around here - i got really confused at this part. i cast off 2, but then my count looked weird and i cast off another. then i realised my mistake and was down a stitch. oh well.)
do 2x2 ribbing for 8 rows
k2, p2
k2, p2
cast off
mattress stitch the seam (this sewing technique is kinda cool - is this how people get sewn up? it totally is!)
done
Having never done any of this before, I had to look loads up online (cast on, cast off, and mattress stitch). I have a book, but trying to learn from diagrams is hard. Thank goodness for youtube.
*I did have a pattern, two actually, but I followed them quite loosely, making my own way as I went along.