Accordign to most manufactures, it take about 100 miles to bed in a set of brakes. But racers do this in just a few laps. Here is some things that you might want to consider:
1. How old is the current brake fluid or when was it last changed?
2. Are you sure there is no air in the system?
3. Are you sure there is no moisture in the system?
Any of the conditions listed above can cause the brakes to drag when they get hot. This is because if there is air or water in the system it will expand as they get hot and force the brake pads on to the rotor. It is recommended that brake fluid be changed on motorcycles at least a once a year or more depending on how much you ride and conditions you ride in.
So if you are unsure to any of the answers above, I would recommend replacing the brake fluid.