@2022changenotecho - when it comes to the actual lecturing in front of a big class, i usually do 1.5h of prep per hour taught - this includes refreshing the material which is based on the latest literature (not just the same old stuff, biomed science moves fast) and also creating in class activities to help with learning of core concepts in context (this changes year on year).
I teach 3 modules per year - which is about 4h per week contact in terms 1 and 2, plus approx 1 hour of pastoral 1 to 1s (+ prep as above).
With 3 modules, I also mark 3 exams (approx 20min per copie) and 3 essays (approx 30 minutes per copy with detailed feedback) for 80ish students.
I also supervise between 2 and 4 under grad dissertations in term 2 and 5 to 6 postgrad dissertations in term 3. This is about 2h per week each, plus ad hoc meetings and feedback on results and drafts (and then marking). This is kind of research, but not really.
then there is the admin - the exam boards, the progress boards, the ethics board meetings, the open days, EDI committee, health and safety committee, the reference letters, dealing with human resources, finance, registration services and international / visa office for tutees and staff, phd application reviews and interviews, convening vivas, etc - plus the research adjacent admin like grant panel work, ordering and financial management - on average easily 5 to 6 h per week
the rest goes to research (writing grant, papers, doing analysis, planning experiments, project management, reading / keeping up to date, as well as reviewing the work of others) and supervision of research students (same as research plus training and feedback on write ups and regular meetings with each of them - i have between 5 and 8 working with me a different stages of training).
i ve probably forgotten a lot of little things which can take a long time...
During terms 1 and 2, my bandwidth for anything but teaching and students / postgrads is limited. I manage maybe 1 to 1.5 day equivalent of research which is not linked to supervision - usually keeping the lab in order, projects on track.
Semester 3 is a bit better, i usually manage to be more creative, to read, apply for funds etc