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Ideally once a month to six weeks, if the dog doesn't get too dirty and has no skin issues.
If your pet is active or likes rolling around in mud a lot, you can wash more often - every two to three weeks.
The main thing is not to overdo it, because frequent shampooing dries out the skin and coat, especially if it's a long-haired breed. And really, a lot depends on the coat type and the individual characteristics of each dog - some breeds don't really need frequent baths at all.
Watch your dog, not the schedule! I knew people who washed their dog every week because "that's what you're supposed to do," and then they'd be surprised when the dog's skin got dry. Really, once a month to six weeks is enough for most pets, unless they're rolling in puddles after every walk.
The main thing is pay attention to the coat and smell. If the dog is healthy, the coat shines and there are no problems, then frequent washing will only do harm, washing away the natural oil layer. But if your dog is active, rolls around in dirt a lot, or has sensitive skin - you'll have to adjust the schedule based on individual needs.
By the way, don't forget about your living situation! If it's an apartment - the dog gets dirty less, so you need to wash less often. If you live in a country house and your dog is constantly getting into things - washing every two weeks might be totally fine. And yeah, shampoo quality matters! Use products made for dogs, not human soap - it really does matter for your pet's skin.
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