How long does the effect of Botox last?

Does the effect of Botox last a long time? Lately, I've been concerned about wrinkles between my eyebrows and on my forehead, so I'm considering getting Botox. I'd like to know from actual reviews how long the effects usually last. I've heard that while it varies from person to person, the effects typically last about 3 to 6 months. For those who have actually had it done, when did you get your next injection? I'm also curious if the effect wears off faster if you use your facial expressions a lot.

I've heard that getting Botox too often can lead to resistance or a decrease in effectiveness, so I'd like to know if that's true. If anyone knows about the duration and tips for maintaining it, please share honestly. 🙏