How often is the typical interval for Botox injections due to developed square jaw muscles?

Maybe it's because I love chewy dried snacks so much, but at some point my jaw muscles started sticking out, and my face turned into a complete square lol. Every time I look in the mirror, my impression looks so strong that I think I need to get injections periodically to relax my muscles.

I was told that since it isn't permanent, I should go back when my muscles start to harden again. Is it standard practice to schedule Botox injections every four months? I'm worried about developing resistance if I get them too often.

However, I am worried that my jaw will get bigger again if I neglect it. I am curious about what you members consider to be the ideal interval for Botox injections. Please share some tips from those of you who manage your Botox treatments healthily while maintaining a slim jawline!