How long does the result last after orthodontic treatment?

I imagine many people are curious about the duration of retainer use after completing orthodontic treatment. In most cases, it is understood that retainers must be worn for several months or years. I am curious to know what precautions should be taken to ensure the teeth settle into place during this period, and for those with experience, how long it typically took. I would like to ask for advice on how you managed to care for your retainers after wearing them.