I wish, they got some good advice in here. But conditioning is a minor part of touring in my opinion. Let me explain.

The two bigger parts are your non-bicycle gear and the biggest is the mental aspect. Getting in shape is easy. Getting out there to ride 60 miles when it's cold, windy, and wet is another. I advise you TRAIN for those conditions, meaning you ride when it's lousy weather outside. Yea, I know, it doesn't sound like fun. But it's realistic if you are going to tour.

Learn how to keep your gear DRY and always have a dry set of clothes to change into. Learn how to keep your shoes dry. If you are going to camp, being able to set up your tent in the rain. Stuff like that. Not being able to stand up to that will either make your tour miserable or end it faster than being out of shape will.

When you train, you should do some rides fully loaded with all your gear. That way you will learn how your bike handles loaded down.

This will test your gear and your resolve. If you can handle that, I think you will have a great tour.

Best wishes.