Interplanetary Transport Network (a collection of gravitationally determined pathways through the Solar System) a trip from Earth to Venus would only take 3 months and the transfers are low-energy.
The Interplanetary Transport Network (ITN) is a collection of gravitationally determined pathways through the Solar System that require very little energy for an object to follow. In addition to orbits around Lagrange points, the rich dynamics that arise from the gravitational pull of more than one mass yield interesting trajectories, also known as low energy transfers. 
