You are making the mistake I made. You don't know dogs, you know a breed (or two). The exercise requirements for dogs radically vary and some wouldn't walk 45 minutes or more without being dragged.

Dogs are just like people... some will go crazy if not running long distances every day.... other are perfectly happy to be lazy on a couch all day.

Some need the stimulation of exploring larger areas... others will mostly ignore whatever yard they have.

I had 3 goldens retreivers over the last 30 years or so, all quite unique dogs. They varied quite a bit, goldens are really two different breeds, the show line (heavier, broader, longer hair, giant flags, etc) and the hunting line (thinner, shorter hair, narrower shoulders, and longer legs). But I was unprepared for a english pointer. I thought I knew dogs, turns out I knew Goldens.

I thought Goldens were active and liked to run, but nothing compared to our English pointer... not even close.