I have a senior job 3 days pw. I earn c. £70k, a not insignificant sum for PT and I do appreciate that I've fallen on my feet somewhat.
The job was advertised at 3 days pw, a decision the organisation took to save money following the retirement of the previous FT incumbent. I.e. it's not something I negotiated.
The workload is absolutely fine in the 3 days, I've no idea what the FT person did all day. What is trickier is being "there" when I'm needed. The role is such that I'm needed in meetings with people who have very busy calendars and I'm often asked to change my days because X can only make such and such a date.
If I consider it really important and/or I'm given enough notice I do change, but I work PT because I have other things I want to do with my time, I'm not sitting around "available" on my non working days.
I've recently got a new boss and I've said no to him twice in the last week. Once because I genuinely had unmovable plans once because frankly, I didn't think the request was important enough to cancel my pilates class and I'm setting some boundaries.
However, I am aware that I'm in a senior, well paid post, colleagues work outside their normal working hours. Should I be more flexible?
Fwiw, I'm nearing retirement and expect no further progression, which means I have nothing to gain from putting myself out, but maybe I should anyway?
Otoh, "they" took the decision that 3 days was enough, so they should work with that?