Hello there Lucie, I have several roles in the organisation for which I work ‘three days’ a week and, probably like you, I find myself working on various things during the week and don’t actual work three discreet days.
I have now trained myself to note down in my outlook calendar the approximate time I spend on something. So, if I start working on a particular programme I mark that down in my calendar, then if I start doing another programme I mark it down in a different colour.
I got the idea from colleagues who are lawyers in the US and have to bill per minute!
At the end of the month I fill in a grid on an excel spreadsheet for each day an total the number of hours I’ve spent on each thing.
The grid has the days along the top and down the side the various programmes and meetings totalling it at the end.
This then shows me whether I’m spending too much time on one thing or too little on another.
It really has helped me become more aware of the time I’ve been spending on each project and shift my priorities accordingly.
Hope that helps!