Inquiry regarding Botox treatment cycle

Title: It feels like it hasn't been long since I got Botox, but it already feels like it's wearing off... What is the typical cycle?
Hello, I am an office worker in my late 20s who has recently become interested in cosmetic procedures and is currently looking into various options. I got jaw Botox for the first time a few months ago. At first, the effect was quite good; my jawline looked slightly more defined and my face felt slimmer. However, it hasn't been that long since I got it, but lately, it feels like my jaw is tensing up again, and I get the feeling my face is returning to its old shape.

I hear from my friends that some say they need to get injections strictly every three months, while others say the effects last for over six months. I know it varies depending on individual constitution and muscle development, but I am really curious about the general duration of Botox's effectiveness and the average recommended interval. I’ve also heard scary stories about developing resistance if you get it too often, so it would be a huge help if you could explain in detail how often I should get injections to ensure safe and effective results!