Does the timing of the effects vary from person to person, even on the same body part?

When I first looked into Botox, I thought I would see immediate changes after getting it, but
I looked it up and found that some people said they started noticing changes after a few days.

Even if you receive the same procedure on the same area
I am wondering if the timing of the effects may vary depending on the degree of muscle development or usual facial expression habits.

I would like to know how long it took for those who received it for the first time to see changes.