How long does the effect of Botox usually last?

I've been worried about my square jaw, so I'm planning to get Botox for the first time.

After looking around, I heard that the duration of Botox effects varies quite a bit from person to person.

They say it usually lasts about 3 to 6 months, but I’ve heard from a friend that they were disappointed because the effects of Botox lasted shorter than expected.

I am wondering if the duration of Botox effects can be longer or shorter depending on lifestyle habits.

For example, will exercising a lot or frequently visiting places with a lot of heat affect the duration of the Botox?

I would also like to know how often those who get regular injections usually get touch-ups. Please share any tips you have for maintaining the effects of Botox for beginners like me!