Now, not a lot, because they're older (10) and Milo's on medication that makes him a lot more mellow/sleepy.
The dogs play together for probably about 30 minutes of hard exercise (running, wrestling) a day. Benji spends the day outside so will sporadically run around but usually he's just resting. He's always been low energy.
Milo gets, aside from his time with benji, some indoor and outdoor ball playing/tugging, probably just like 10-15 minutes a day, though. He's been going for 2 hour training sessions (yes it's long) to work with me once or twice a week, which is nice. When he was younger he got all of that plus walks a few times a week (maybe 2-3 times) and once a week or so we went on a longer hike, to the beach, etc.
When our pool opens he will swim about an hour a day, or at least he always has in the past.
My city dogs in the apartment got:
20-30 minute AM walk
Short 10-15 potty break midday and dinner
Long 30-60 minute walk each night
One got time on the long line/playing ball a few nights a week, and the other did the dog park 2-3 times a week. One was also able to go run errands and cafes and stuff with me, so that was a few days a week. They each got 10 minute training sessions once or twice a day.