Buddy get's walked 4 times from Mon-Fri and 5x on Sat & Sun. I like to walk
He's 5 now but this schedule has been in place since he's been 6mos old.
This is our Mon-Fri schedule. Weekends happen when they happen

but good for 5 times out.
6:10- am about 15mins
8:00- am right before I leave for work about 15min
5:50- pm as soon as I get home around 20-25mins
9:30-9:45 pm before bed time. about 15 mins.
He can hold it at least up to 9hrs. I have never been longer than
that and that's really pushing it if I am stuck in traffic.
When I am home he get's that extra walk sometime after lunch
just for fun.