One palace is useful. A network of them is where this technique starts to feel unreasonable. Serious practitioners keep a dedicated palace per topic, one for grocery/errands, one for each class they’re studying, one for speeches, so nothing ever gets mixed up, and each palace can be revisited and reused indefinitely.
Building more palaces gets easier the more you do it: any place you can walk in your mind qualifies, a childhood home, a familiar walking route, even a favorite video game level, as long as the stops are fixed, distinct, and in a consistent order. Keep a running list of your palaces and what each one is “assigned” to, so you always know where to put new information.
Below, inventory the palaces you already have (or could build) and what you’ll use each one for.