Maddie watches a total of 8*44=<<8*44=352>>352 minutes of the TV show during the week.
On Friday, she watches 2*44=<<2*44=88>>88 minutes
On Monday, Thursday, and Friday, she watches 138+21+88 = <<138+21+88=247>>247 minutes.
Thus, on the weekend she watches 352-247 = <<352-247=105>>105 minutes of the TV show.
#### 105