And how old are you and do you have housing costs and dependent children?
Assuming annual sum has inflation built in?
My figure right now would have to be pretty high, lots of mortgage left and early teen DC, I’m late a 40s sandwich filling and therefore dreaming of quitting work.
Once mortgage paid off I’d not hesitate on 20k. Maybe lower, would need to do some sums, but for the purpose of this tough and ready question 20k sounds about right. Obviously more comfortable once state pension age kicks in.