… remember to pay close attention to your hydration and nutrition on the bike. I have made the mistake myself, thinking it’s “only” going to be a 2 or 3 hour ride, and I could “make do” with a bit of water. Full-blown bonks are no fun! I have also found that I need plenty of salt and electrolytes on long warm rides – though everybody is different when it comes to sweating. Here are a few resources with more details:
Hydration and nutrition on long rides