I can tell you that these bikes will take a beating and keep running. The most important thing you have to do now is proper maintenance. Scheduled chain cleanup/lubrication, oil changes, etc. Just follow the manual's recommendations and you will be fine.
When riding 3-4 hours straight, the only problem I can foresee is you getting tired of the riding position, because the bike could go for 12 straight hours with no problems.
Be safe, and enjoy the ride.