Prepping for 3+ months is definitely not the baseline. I'd really need some convincing that you're getting any real incremental benefit past a week of interview prep. There's not that much ground to really cover and at some point you're just solving different versions of the same problems over and over again.
A majority of the time is spent on the "LeetCode grind." You can evaluate your own progress while you solve practice problems by checking time and checking how many solutions are correct on the first submit. Most likely 1 week would barely be enough to establish your baseline performance per category (DP, trie, etc.).
