How often should I expect to get wrinkle Botox?

What is the appropriate Botox injection cycle for forehead and eye area wrinkle care?
I am looking into a procedure to prevent fine wrinkles because faint lines have started appearing on my forehead and around my eyes whenever I make facial expressions. I have heard that injections are usually given every 3 to 6 months, but how do those who receive consistent care actually schedule their wrinkle Botox treatments? I would like to know if I need to get another injection immediately when the effects wear off to prevent wrinkles from deepening, or if it is better to maintain a consistent cycle. I have heard that getting injections too frequently can lead to resistance, so I am curious about a safe frequency that allows me to see results while minimizing the risk of resistance. It would be very helpful if those with experience could share their honest advice on how many months it usually takes for expression lines to become distinct again, as well as the recommended Botox intervals and maintenance tips for each individual.