How long does the effect of weight loss injections usually last?

Hello! Recently, as my interest in dieting has grown, I’ve been looking into various weight loss injections. They have become so common these days that you can easily spot people around you trying to lose weight using them, haven't they? However, since I think it would be difficult to keep getting them continuously... I became curious about how long the effects last once I get a single injection! In particular, I expect the duration of action to vary depending on the type of injection... and since it seems to be different for each person, it is difficult to know the exact duration. Thinking long-term... I feel like I will definitely lose weight, though.

I think the duration is important to maintain it, and I'm a bit worried about what everyone usually does after stopping the weight loss injections! I would appreciate detailed opinions from those who have experience or are knowledgeable about this!