How long does the hair loss treatment last?

For those who have undergone hair loss treatments, how long do the results last? I was recommended hair loss treatment at a clinic, but I'm worried because I don't have much information about it yet. I have picked up a few things about hair loss treatments and know I should start soon, but since there are so many daunting stories—such as claims that you have to do it for life once you start, or that there is no such thing as a complete cure—I wanted to discuss the duration of the effects. Specifically, I'm curious about when the effects start to appear and how long they last. Also, is it okay to receive treatments for the rest of my life? The clinic seems to say it's fine. I really want to have thick hair, but they told me I shouldn't actually expect that much. I'm also curious about how much recovery you've achieved. I have so many questions. I would love to hear advice from those who are currently undergoing or have received hair loss treatments!