Campfire's are scatted all throughout the world, the first of which is next to Cassar Village right at the start of the game. It will speed time forwards upon use. Be aware that your hunger will increase more rapidly using campfires, so have plenty of food spare.
You don't need to use the camp for the entire time as cutting it off early will count. However, you can only use campfires once per day so either earn this over time while playing, or alternate with a Tavern to allow you to use the campfire again.
The latter method will allow you to earn Noble Tourist at the same time.