How long should you try? Until.
"It might be hard, the road may seem long. You're tired and ready to give up. But can you really quit now? Right when you are so close? Most people give up too soon. Most will say enough. Will you? If you know what it is you want, go for it! You can do it. Don't let anything or anyone stand in your way. Try.... and do... until. It's easy to quit, but not you. You are a warrior, fight for your dream!"
Motivational Pictures, Nature