Engelbart created the first mouse prototype in 1963. He showed off the capabilities of his invention, and of software developed to make use of it, in a famous 1968 demonstration.
As amazing as his demo was, it would take almost three decades for the mouse to reach a mass audience. Apple released the first successful mouse-based computer in 1984, but text-based DOS continued to dominate the industry until Microsoft developed tolerable versions of Windows in the early 1990s. The release of Windows 95 in 1995 signaled the final triumph of mouse-based computing.
That might seem like a long time, but as computer scientist Bill Buxton has argued, thirty years is actually a typical amount of time for a breakthrough computing invention to go from the first laboratory prototype to commercial ubiquity.