I purchased Rocket Languages last year, but haven't had much of a chance to practice. I emailed the question if there is a time limit that I must learn my language by. They quickly responded that I have a Lifetime membership. That is what I was expecting, and what they delivered. Very Good. I encourage others to buy their language product and not be worried about how long it takes to learn. And that even includes any changes and improvements that they make to the course in the future.
With that type of Customer Service, they can be trusted!!
Steve