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I think you are blowing a perfect opportunity hear by trying to "endure" your "mindless" job. I was a grocery store janitor for eight months and it was pretty similar to what you describe. Mindless work for a drone, not a human. But I loved it because it allowed me to focus on my thoughts and sort them out inside my head. And I got paid for it! The fact that you are staying in motion, doing the same thing in repetition, can help the job take on a meditative feel. So long as you have the right perspective. Yes, if I was going to be a janitor for the rest of my life I would have probably been looking for a convenient bridge to jump from. But knowing it was temporary helped me see it as a great opportunity to dedicate some time purely to what was going through my mind.

My point is that I think you should use this time to pay attention to your thoughts, whatever they may be. When you start on your "dream", you may not have the luxury to do this; your thoughts will need to be too focused. If you are the type of person that finds it difficult to be doing mindless type work, and who needs more stimulation, perhaps you can use this time to learn how to make the mundane interesting.