How long would it take to fix my snaggletooth/smile? (Photo)

Your best option is to see an orthodontist and consider having braces.  This would be the most conservative way to dramatically improve your smile.  Good luck.

It appears that you have some crowding and unaesthetic angulations of your teeth in both your top and bottom jaws that could be greatly improved by orthodontic treatment, possibly even Invisalign. While this treatment may take longer than lets say veneers, its much more conservative because it won't require any irreversible shaving of teeth to get the improved results your looking for. But make sure to definitely be seen by an orthodontist who is specialty trained to treat someone like yourself. Good luck!

You really only have one good option to correct your smile and that is with orthodontics.  Your teeth are in the wrong place and need to be moved to the right place.  You are correct, you have a significant crowding problem.  Find an orthodontist you trust and have a conversation.  I am sure you can come up with a plan that works for you.  They will be able to make an estimate of the time it will take.  Good luck!