First round of Botox in my jaw (Masseters) lasted a good 4 months without movement, and my forehead/crows feet was still so good after 6 months that I asked the Dr before getting a top up.
Second attempt has barely lasted 2 months, and I have more movement in my forehead now than after 6 months last time. Also, it started working the same day this time... Friend has been getting it for 10 yrs, but used my Dr and has the same issue. They say it's normal and we need to get top ups. Not convinced..