I don't think there are hard and fast rules about how much exercise is required. With our dogs we've always walked them either once or twice a day regardless of their breed. We find that they set their own pace and when they're tired we just tend to walk with them rather than keep thrwoing the ball etc.
It depends on the dog. Some dogs can be extremely high-energy, and others can be calmer and quieter. Generally, an Aussie needs two or three hours of exercise per day, as well as mental exercise such as training.
If your dog is bouncing off the walls if you take him for an hour-long walk, you need to exercise him more. If you're considering purchasing an Aussie mix dog, expect to have to exercise him/her for at least two hours every day. These are extremely high-energy dogs, and in the majority of cases mixed breed dogs with Aussie in them are going to be high-energy as well.
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