How do Learning Puzzles Work?

My chess teacher told me to do more puzzles to work on my tactical abilities, and to focus on specific themes based on mistakes I've made throughout the week. He also told me that I should return to puzzles I've missed to solidify the pattern. I've noticed that when you solve puzzles based on theme, you can see your puzzle history for custom puzzles under Stats > Puzzles > Learning (Recent Puzzles). I can tell which ones I need to return to based on my score for that individual puzzle.

This leads to my question: Does this queue get deleted over time? I've noticed that my puzzles in this section only go back as far as a day ago. I don't want to lose the puzzles that I've gotten wrong, and I can't find this information anywhere online. I just want to be sure. Also, if anyone has a better way to organize/access puzzles I've gotten wrong to maximize my training efficiency I would appreciate the advice.

Thank you for entertaining my silly questions.

I believe your history only goes back to your past 25 rated puzzles, past 25 learning puzzles, and past 10 puzzle rush.

Okay, thanks for the response.

Yes, copy that.