What is the recommended Botox treatment cycle for a natural look?

I feel self-conscious looking in the mirror because of the fine lines that appear around my eyes and forehead whenever I smile. Since it seems like nothing beats Botox for cost-effective skincare, I plan to make an appointment soon. I understand that the effects of Botox usually last about 3 to 6 months, so I am curious about how often everyone gets injections. I am worried about developing resistance if I get them too frequently, so checking the appropriate interval seems really important. Injecting it into the jaw muscles or between the eyebrows would definitely make my impression look softer, so I would appreciate advice from those with real experience. I am also wondering if it is possible to apply makeup and go to work immediately after the procedure without any visible signs.