MIL seems hell bent on winding you up. What a small minded goal. Thirty hours without a break is a long time in any job, even one you love.

As for potty training. I'm a firm believer in the 'naked in the garden' strategy. You can point and say, 'look where the wee wees come from' with a smiling interested voice. It takes all the stress out. The whole thing becomes more of a discovery and you have a great excuse to potter in the garden :D

Good luck with the rest of your week.