It's a classic chunk of martyrdom that has Elly point out how long she can be sick.
Panel 1: A freaked-out John tells Elly that he's sorry she isn't feeling well.
Panel 2: He reminds her that he took Lizzie to the sitter and Mike is in something called craft class.
Panel 3: He then says that he can pick Lizzie up on his way home but there's no way he can get down to collect Mike.
Panel 4: A bleary-eyed Elly says that that means she can be sick until 11:45.
Summary: This is because Lynn wants us to believe that a moderatley prosperous dentist's wife couldn't afford to have hired someone to come in and do all the joe-boy jobs when she's feeling sick. It amazes me that the Kool-Aid Quaffers never realized that we should have spent Foob history discussing the quality of the Pattersons' domestic help.