Is laser hair removal permanent? I'm curious about the duration.

Everyone seems to be getting laser hair removal, and I wasn't interested at all until recently. I'm curious how many sessions are typically required for clean hair removal and how long the results last. Is it permanent, or do I need to get it redone periodically? It seems like you usually pay for a set number of sessions at once rather than per session; how many sessions are typically needed? I'm also wondering if prices vary depending on the area being treated. Finally, I'm curious if I should do the legwork to research and visit clinics for this procedure, or if it's okay to just go to a mass-produced clinic to get a cheaper price. I would be really grateful for any answers you can share!