I meant like actually register the cache so it shows up on people's devices.
Well, depends on how you want the listing to look like. There's an online form that you have to fill out (name of the cache, coordinates, difficulty ratings, attributes, short and longer description, maybe a hint or a spoiler photo). You can use HTML or add a background pic.
If it's a simple listing, it will take about 10 minutes.
Then you submit the listing to a reviewer and when there are no problems, he will publish it as soon as he finds the time (which can take from 5 minutes to several days).
Nick: nice!!
We did a great 4.5 hour night cache yesterday. Thematically, it's about an evil cult. In the containers, we got a bloody hand, a bloody foot, a Ouija board, a tape recording, a switch that turned on a large cross on a tree and more interesting stuff. We started at around 10 pm and 2 hours later, we came across 4 people coals, speaking no word, just passing us by. A few minutes after that, 3 others blocked the trail, again saying nothing. We had to pass them. They did nothing, but slowly followed us to the tree where we had to solve a riddle. After a while, they unmasked. Man, what a great addition to an already great cache! Some people are investing a lot of time, money and energy in making a cache special.