I can't talk about the pace of learning. However, if you invest a lot of time learning a foreign language, you must make sure you will keep a regular exposure to the language after you have completed the intensive learning. Otherwise, you will lose all you have learned very fast.
In my opinion, the best exposure to help retain what you learn is living in the language. If that is not possible, watching TV or listening to audio recordings in the language in question on a daily basis, will allow you to retain what you have learned and help learn how to speak.
If you are not constantly exposed to the foreign language, you will not be able to learn it.
René
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