A lot of squares

Its good to have some crochet on the go for long wet cold winter evenings. I told son Mark and his girlfriend , who live in Norway that I was crocheting a blanket. "Its cold in Norway", they said, "we need a blanket". I'll make you a blanket, I foolishly replied.  I need to crochet 144 squares to make one blanket. Each square takes about half an hour unless you are watching something foreign on the TV with subtitles, in which case it takes twice as long because you have to keep unpicking your mistakes.  
Its rained all day. Have not been out.