It’s not 2.5 hours, it works like this : go drop / pick up the kids, use a car 20 mn, 0 steps. Walk : 30 mn 3k steps. Groceries same, and you get to walk back with 20 pounds, etc.. so it's more like one extra hour to reach those 20k when optimizing.
I'm minimizing the time I sit, one hour of workout barely compensate 6 hours of sitting in a day, iirc, like ACM or cardiovascular health for 8 hours sitting is the same as 14 hours + 1 hour workout. Most of the days I sit less than 4 hours.
Ask our local doctor
@Izo , too much sitting, deadly! I thought I would lose weight, and I did, but I didn’t expect to gain that much muscles. It seems to be more efficient than workout coaches expects.