How long does the effect of obesity injections usually last?

Lately, I've been looking into various options because I'm more curious about how long the results last after a single treatment than the weight itself. That's how I learned about weight loss injections, but I'm worried that even if I see changes at first, they might quickly return to their original state over time. For those of you who have actually received these injections, how long did your satisfactory results last after the procedure? I'm also curious if combining them with lifestyle changes or exercise makes a difference in the duration of the effects. I'd like to know if I typically need multiple injections to maintain the results, or if I can receive additional treatments as needed after a certain period. Those with experience, please feel free to share your actual duration of results and maintenance tips!