The flight time to Venus will depend on the design and nature of the spacecraft's rockets, and on the purpose of the trip. For unmanned robot probes, travel time isn't really an issue, so we can launch the probe into a long, slow, energy-saving path which might take a couple of years to get there.
we've never sent humans to Venus - or anywhere beyond the Moon. (Since Venus is uninhabitable, there's really no point to going there in person.) But if we ever do, the most practical transfer orbit will take about 9 months.
Of course, if we had infinite fuel and could accelerate at 1G for the entire trip, it would take about a couple of days to get there, depending on where Venus and the Earth were in our respective orbits.