I love german shorthaired and wire-haired pointers. I admire you for being able to keep up with one!
Jet and Lexi are busy, but they wear each other out so I don't have a lot to do. Jet goes to obedience class once a week and will be competing in AKC rally events this fall. Jet and Lexi get a 30 minute walk every morning and a long game of fetch every evening. Jazz has always been very low key, not very active. Her walks have always been about 10 minutes long, she used to go on more walks than she does now, but she still walks down to the corner with me every morning. Jazz is my alpha. She keeps Jet and Lexi in line and they respect her space, but she doesn't really play with them, never has. She's always watched them and told them off when they've gotten close to knocking over something.
That's the advantage of adopting senior pets. Old dogs are usually perfectly behaved and very low maintenance.