Large worlds are just... really really LARGE, it's crazy. I think I went on a mining binge and spent HOURS just digging down. Finally found skeletons and glowing mushrooms, was so excited... I think it took me like 30-40mins of digging straight up to get out. Maybe it was shorter , but it felt like it took FOREVER. I found a Regen ring though, and a second pair of flippers! The ring is so nice.
I came up to a blood moon, lmao.
Also, another question; how high up are floating islands on a large world? I found one on the small world simply because the vines coming off of it was juuuust on the top of the screen when I was on my small skybridge.