It never ends.
I don't do online shopping but don't count going to the shops as life admin.
DDs need exhaustive researching to get the best deal every year. That's hours each time.
For everything: mobiles (x4), broadband, fuel, insurance, etc
Then there's all the car admin. MOT, insurance, servicing, repairs, tax. Replacing.
Household- repairs/ maintenance- buying equipment, arranging work people. Paying them.
Buttering is an ongoing task. Daily current account monitoring. Monthly going through expenditure.
School admin. Letters, signing things, trips, payments, dressing up, presents, dinners, etc
Managing social diary. Booking/ planning trips. Kids parties, presents, cards, wrapping, transport. Childcare for other dcs. Research parking. Packing/ unpacking.
Christmas and birthday admin.
Work admin- professional registration, clothing, social/presents. Commuting. Job hunting. Extra training.
Health and well-being- gym membership, kids activities, doctor dentist optician etc appointments for all the family.
Wider family- helping older relatives to do stuff online etc.