So many variables! Minus mortgage our 'expenditure' is about £3000 a month but that covers absolutely everything (and £500 is childcare): Christmas presents, food and events, birthdays, Halloween costumes , haircuts and personal care such as dentist, car and home maintenance funds, yearly subs like Prime and various insurances, boiler service, entertainment, clothes for us and the kids, kids classes, household items, and so on.
We don't spend that every month out of our account, but it's how much we need to put aside a month to cover everything so it's there when we do need it. So for example by Christmas each year we will have say £600 in a savings pot for gifts and food and a further £150 for Christmas events.
So it depends what you mean by expenditure and what you need to cover. But a lot of people don't account for many of the above expenses in their budget so then have to find that money when it rolls around.
In terms of just paying the monthly bills, it's a lot less. Probably less than £2000 and £500 of that is childcare.