I used to work at a ice plant/cold storage as a teen. Hanging a deer was a common practice back then.
During hunting season we world have scores of deer hanging up and ageing. The butcher shop would come by and get a few at a time to cut up for their owners.
The average hanging time was roughly a week to ten days.
Sometimes the owners would come and get them and work them up themselves.
We hung the ones we killed for around ten days when I worked there then worked them up.
Otherwise, and weather permitting, we hung them at home in a unheated outbuilding for three days give or take.