Have you tried given a read to the recently made MILD tutorial? In it, you can read that the deal of the mantras is not about the words, it's about the connection you make between the sentence and your intention. If you were disciplined on your goal, even a mantra of "Banana" could do the job, as long as it clearly reminded your of your wish to lucidity. And in case you ask, don't use "banana" as your mantra We use specific related sentences/words because they make the though redirection/memory retrieval process much easier/faster.

As the tutorial itself mentions, there is no fixed time for a lucid dream occurrence. It depends on so many factors (I'm sure that many of them are still unknown to us) that is literally impossible to guess. Some people take a few days, others take weeks, others take more than a month. You can indeed speed up the process by focusing harder and increasing the frequency of your exercises/practice, but in the end, you're merely increasing the odds, not achieving a granted occurrence. Besides, you're mostly stressing yourself if you dwell too much on this issue. Relaxing and just keeping the practice up seems the best way to induce lucid dreams. Besides, stress kills recall and lucidity

Here's some questions of things that might appear obvious, but many people forget to check:

- Are you still questioning yourself? Doing reality checks?
- Is your amount of sleep time decent?
- Is your recall good?
- How much time a day are you taking to think about lucidity? Do you remember your intention as soon as you wake up?

For last, 1 week is by no means a huge amount of time. In an experience I once did, achieving lucidity only by the use of reality checks (not even questioning or dream journal) it took 21 days to get a lucid. On other occasion, it took me 3 days. Other occasion, it took me 1 week. As you can see, it varies a lot, unless you maintain a steady practice based on habit formation, which can take quite a while.