Lloyd, for what it’s worth,
I have found that during my desert quail trips which typically last 6 to 8 weeks, if I can bump my mileage up to something close to 20,000, 3xtimes a week, which is three hard days of hunting with the dogs, in about four weeks my body really begins to show a recontouring.
A much more healthy shape from top to bottom.
Something for you to work toward
If the amount of time you have available is limited, then, you can increase the pace.
Something around 11- 12 minutes per mile has the same impact.
And take care of your feet. Invest in a decent pair of walking trainers.