200 miles is a long ride.
To do it in one day, well, that is not the easiest thing in the world.
I found there are 4 critical things
"Eat before hungry, drink before thirsty, don't litter"
"Have to learn to eat/drink without stopping"
"Put the empty (sticky, messy) gel packets in your jersey pocket"
Yeah, right, sticky gel packet mess all over the place: sticky shift levers, stick brakes, etc
There are 5 things I need to manage