WorkingClassMum - you are an absolute legend
Rule #15 - You will be expected to smile politely at clueless comments from childless female coworkers who say things like 'Oh it must be so nice to only work 4 days per week, you're so lucky, I wish I could do that' or 'That's so great you get Mondays off - must be so awesome to have a three-day weekend!'
Listen, bimbos - I don't work four days per week. I work SEVEN days per week. I'm a MUM - it's a full time 24/7 gig! On the four days you mention, I'm actually working at two jobs: my mummy/housekeeper job and my office job. Yes I am not in the office on Mondays, but it's not a 'day off' - I have a toddler to care for, a house to clean, grocery shopping to do and errands to run, for gods sake! I don't spend my Mondays sleeping in and then watching DVDs all afternoon while painting my toenails and sipping cocktails!