OP I work in a post 92 in senior management of an area which includes our School of Education.
Honestly, if you want fewer hours, it's not for you. Academia is a very long hours job. Education has a particular culture within that and may be less demanding - for ex, not requiring a PhD - but it is not a 9-5.
A full time academic in my institution who did not have a PhD would be expected as a minimum to -
Teach 4 modules a term incl module leadership (this involves all curriculum design, co-ordinating a teaching team, marking, tutorials and study support)
Take on some administrative duties such as programme lead, or admissions tutor, or marketing or dept social media
Substantial pastoral tutoring load and/or professional supervision
Supervising and marking dissertations
Standard additional duties would include attendance at open days (weekends) and Clearing in August, also marking summer re-sit work
That would be an absolute minimum and tbh, you would probably be regarded as not pulling your weight with that and in some depts even subject to performance management.
The likelihood is that in addition to the above, you would be expected either to have a PhD on the go with realistic timescale for completion and if not, a substantial community engagement project ("KE" in the jargon or knowledge exchange).
Sorry but as a previous head of dept I think you need to be a lot hungrier and more focused, and show a bigger appetite for the work.