Our drive from Bled to Maribor was about 2 hours. Pretty crazy to think that you can drive across country in 2 hours. We arrived in Maribor and decided that since we still had the car we would go check out a town called Ptuj which was about 20 minutes away. Not sure it was worth the drive but it did allow me to fill up the car before returning it the next day.
Ptuj was pretty quiet. Not many shops were open so we just did an hour walk around the city before returning to Maribor. This part of the country is really popular for wine. I suppose if you like wine then you would have a great time visiting all of the wine cellars.