“… On month 3 of Akhet, days 21-4, it seems that Pennub was off work because he was looking after the ill Aapehti. The most frequently recorded reason for absence is illness (over a hundred times), including 'eye trouble', and 'the scorpion stung him'; the next most frequent is being away with one's superior doing private work for him, a practice that was not forbidden if done in moderation…”

I guess it's like when you're the assistant to a movie studio executive and he/she asks you to wash their car for them.

At the beginning of 'Inscription position: front', it looks like it was not done in moderation

As they say: everything in moderation... including moderation.

The British Museum link has it buried under curator's notes (have to expand it)- it means they worked directly for their boss on the boss' project.