How long does any particular region of vents last? If these active geological phenomena are anything like volcanos, some of them might well last for millions o

How long does any particular region of vents last? If these active geological phenomena are anything like volcanos, some of them might well last for millions of years, which is plenty long for biological evolution. I'm not sure if this is the case, but it seems to me it could be the case that some vent regions are isolated from others, such that life adapted to one cannot find it's way to another. This is certainly the case with many species of troglofauna (cave dwelling creatures.) Destroying one group of ocean vents may wipe out numerous species of life that exist nowhere else.