What do you guess is the starting day? I think it should be Friday (1st day) to make sense. D's arriving Friday afternoon/evening (after F is home from work) and F is back to work on day 4 (Monday).
But then ...
Martin gives F some more days off on the 2nd sunday (referring to the schedule above), F tells it D and the next morning he's telling her he's goging to work (as an excuse for meeting G) ... strange.
On the other hand ... they seem to live in a parallel dimension (like is said when talking about pubic hair
) ... so their week and working periods can be structured otherwise (what would not explain the bad excuse rom F ^^ )