Instead of launching a large ship that would take a long time, the authors of the concept suggest launching a few small cubes that would gather themselves in a weightless state and start moving towards the point of the solar gravitational lens.
This point represents a straight line between any star around which an exoplanet rotates and somewhere between 550 and 1,000 a.e. on the other side of the sun. It's a vast distance far beyond 156 a.e., which Voyager 1 took 44 years to overcome.
To overcome such a long distance, the authors are going to use the gravitational impulse from the sun, a proven and reliable method, the fastest ever created of human objects, the Parker Solar Probe probe, used it.
What exoplanets are going to be studied with the help of a mission is not yet known; at present, more than 50 exoplanets are in the inhabited areas of their stars.