When do the effects of Botox usually appear?

Hello. I am planning to get Botox for the first time, and I have many questions, so I am asking here.

I am curious whether the effects of Botox appear immediately, or if it takes a few days for changes to start becoming visible. I looked it up online and found that the timing of the effects varies from person to person, so I would like to hear some real-life experiences.

I am particularly curious if the onset of effects differs for forehead, glabella, and jawline Botox. I would like to know how many days after the procedure the sensation of muscle movement typically decreases, and when the most natural and definite effects appear.

I am also curious about how long it takes for the effects to fully take hold, and whether the effects might appear later for those receiving it for the first time.