Roughly how long should I expect the effects of the obesity injection to last?

I am looking into obesity injections because I want to maintain a healthy physique for a long time without yo-yoing after weight loss. Generally, how long should I expect the effects of obesity injections to last, whether after a single injection or completing all recommended sessions? I am also curious if the reduced food intake or satiety tends to persist for a long time even after stopping the injections. Do I immediately return to my old appetite once treatment stops? I do think it will... but does that mean I would have to get them for the rest of my life? How do others manage their weight? I would like to get the injections at Maypure at a reasonable price that isn't too expensive.