I love it when the baking/cooking and teaching worlds collide.
Just now, as I was preparing a comma lesson for my students, I stumbled upon this example sentence in the Diana Hacker Rules for Writers manual:
Even though Pavel had studied Nigella Lawson's recipes for a week, he underestimated how long it would take to juice two hundred lemons.
Two hundred lemons?! Honestly, Diana?
Well... I guess Pavel could possibly be making lemon tarts for the mess hall. What do I know?
The important bit is that there is supposed be a comma after the word "week". JSYK.