Lesson #4: Rose hates staying in the office as much as he does
Rose has one of the highest positions in Torchwood. Of course, she's the director's daughter, Pete Tyler. But Rose only got the job in Torchwood to find the way back to her original world and to the Doctor (especially to the Doctor). Well, she was able to get him back and stay with the Doctor/John, so she did not need Torchwood anymore, right? Wrong! They needed jobs. John works in the lab and Rose... in an office.
What saves Rose's day is to go on a field mission. From time to time, they are grateful that they have to investigate cases of alien attack somewhere. Did she learn this from him and cannot stand in a room anymore? Does she have to run around after aliens like him?
Anyway, staying in a room filling paperwork lets her stressed out, but so would he. So John knows when she needs a little more attention.