Well, let's set the edge of the solar system as the widest limit of pluto's ellipitical orbit of 49 AU.
Better make that 50, the math is easier.
Now and AU is the distance of from Earth to the Sun. Now, as we know light from the sun takes 8 minutes to reach us. So the distance between us and the sun is 8 Light Minutes. Or 480 light seconds.
The distance in light minutes between Pluto and the Sun is 400 light minutes (about).
So we need a way of travelling at least 57.15 light minutes a day. Which is just under 2.4 light minutes an hour.
Effectively this means that we'll have to be going... uh I've lost my place.