Quality is more important then quantity.
Today we had a 20min road walk to the fields, then about 1 and a half hours off lead meeting other dogs and playing then 20 min walk through the town centre so I could check my bank balance!!, but very interesting smells for the dogs..
Now 2hrs later they are spazzing out again..Seriously if you want a low energy dog, dont get a Chihuahua!LOL