Re: How much exercise is enough for a Vizsla in an apartment?
I'm a little late to the party, but I wanted to remark on the running. We run with our V 4-5 times a week, up to about 10 miles for long runs (I don't like him to go further than that). He did great with the running in all temps, just about, until he was about 4 years old. We didn't start running distances with him until he was about 18 months. Now, we cannot take him for a run if it is over 75 degrees. After talking with his breeder, that's a pretty common thing. Now we get up early for those long runs and try to get home before it gets warm. Always take water with you for them and check their paw pads often, especially in the beginning. Rex once ran until his paw pads were bleeding but he wants so bad to keep us happy, he continued to run. I carried him for the next 2 days since he couldn't walk at all. If they're panting heavily, stop until the cool down and offer water. It can mess up your training schedule, I know, but it can really mess up the dog if they overheat. Remember that the dog cools himself down through his paw pads and through panting. His paw pads will likely be hot if your running on pavement, so that leaves him only with panting. Their tongues swell when they're hot, so if it's very wide and hanging out very far, stop until they cool down. If they lay down during your run, wait until they're ready to continue.
As for not running him daily, I think that's perfectly fine but he will still need some sort of structured walk. I will second (or third) the suggestion of mentally wearing them out, too. Even at almost 7 years old, we still try to train with him to keep him thinking.
Good luck! Rex is the best running partner I've ever had and I hope you feel the same way about your V.