Months
To feel steady on the basics, for most people who study consistently.
Become a trainer
Online learning is a fine front door. Here is what to do before, during and after it so that you end up able to work with actual dogs.

Dog training is generally unregulated in the United States, so there is no exam you must pass to start. You may need a standard city or county business licence, and offering boarding or daycare can trigger extra rules. A short call to your local licensing office will settle it.
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Starting with a course gives you vocabulary. Adding hands-on practice quickly stops you from building confidence on theory alone. Leaving the business tasks until last is fine, as long as you do not leave them off the list entirely, because a lot of capable trainers never get around to the website and booking side.
To feel steady on the basics, for most people who study consistently.
Of practice before many trainers feel fully confident with clients.
For a full client list. Building demand often takes longer than building skill.
These are general expectations, not promises. We do not publish income figures.