Well, that's not something that can be predicted precisely. It could continue for a while if the story has more to unfold or come to an end sooner if the plot reaches a natural conclusion.
The Chainsaw Man manga has a considerable length. It consists of multiple volumes and chapters, but the exact number can vary depending on how you count and which editions you refer to.
I don't have the exact figure off the top of my head. But a quick online search or checking with manga enthusiasts should give you the answer about the number of Chainsaw Man manga volumes.
I think you should. The Chainsaw Man manga has great art, an engaging plot, and characters that grow and develop throughout. It's definitely worth giving a shot.