As long as new projects and coins enter the cryptocurrency world, as well as this forum exists, Bounty programs will run. These new projects and old projects which wish to refine their strategies need the help of bounty hunters to spread the awareness across all over the globe.
I think it is a very long time, as long as there is still this forum it is always available to us projects that give us prizes. so also as long as there is an ICO project, there are always programs with prizes. because they need a promotion. in this way we promote their programs.