It depends on if it's my week with my daughter or not. If I have her, Friday. That way I don't have to wake up early for work and can lounge around with her in the morning after she wakes up and we can have that entire day to fuck around. If I don't have her, Monday. Since she goes back to her mom on Sunday afternoon, I can use Monday to recover from the previous week. Because by the time I drop her off on Sundays, I'm pretty drained. She's a little tornado.