How many Botox treatments are recommended, and what is the interval between them?

I am writing to inquire about the recommended frequency of Botox injections. I am planning to get Botox for the first time, and I would like to know how many sessions per year are generally appropriate. I am also curious if the recommended number of injections varies by area, and I am concerned about potential resistance or side effects from getting them too frequently. I would appreciate it if you could tell me how often I should get injections to maintain the effects for a long time, and if the recommended frequency differs by area, such as the jawline or forehead.