Actually, what happens is that there are 7 random Oblivion worlds and 90 possible random gate locations in Cyrodiil. a maximum of 50 out of those 90 locations will "spawn" an open gate. Initially, all open gates are unconnected to any of the worlds. When you enter a gate, an unused world at random is connected to that gate. If all 7 worlds are in use and you enter an 8th gate, the world that's been left idle the longest will be disconnected, respawned and reconnected to the gate you just entered.
For example, to simplify things, let's say there are only 10 gate locations, you enter gates 1 through 7 in sequence, and the game chooses worlds at random. You might get...
Gate 01: World 5, 60 hours idle, 12 hours left until respawn
Gate 02: World 7, 52 hours idle, 20 hours left until respawn
Gate 03: World 2, 50 hours idle, 22 hours left until respawn
Gate 04: World 6, 40 hours idle, 32 hours left until respawn
Gate 05: World 3, 30 hours idle, 42 hours left until respawn
Gate 06: World 1, 12 hours idle, 60 hours left until respawn
Gate 07: World 4, 10 hours idle, 62 hours left until respawn
Gate 08: -
Gate 09: -
Gate 10: -
As you can see, all 7 worlds are in use. What happens if you enter Gate 09? Well, the first world you entered was World 5, which has been left idle the longest (60 hours). So World 5 gets disconnected from Gate 01, respawned and reconnected to Gate 09, and we end up with...
Gate 01: -
Gate 02: World 7, 52 hours idle, 20 hours left until respawn
Gate 03: World 2, 50 hours idle, 22 hours left until respawn
Gate 04: World 6, 40 hours idle, 32 hours left until respawn
Gate 05: World 3, 30 hours idle, 42 hours left until respawn
Gate 06: World 1, 12 hours idle, 60 hours left until respawn
Gate 07: World 4, 10 hours idle, 62 hours left until respawn
Gate 08: -
Gate 09: World 5, 0 hours idle, 72 hours left until respawn
Gate 10: -
OK? Now what happens if we fast-travel BACK to Gate 01 and enter it? Now, it's World 7 that has the longest idle time of 52 hours, and gets disconnected from Gate 02, respawned and reconnected to Gate 01...
Gate 01: World 7, 0 hours idle, 72 hours left until respawn
Gate 02: -
Gate 03: World 2, 50 hours idle, 22 hours left until respawn
Gate 04: World 6, 40 hours idle, 32 hours left until respawn
Gate 05: World 3, 30 hours idle, 42 hours left until respawn
Gate 06: World 1, 12 hours idle, 60 hours left until respawn
Gate 07: World 4, 10 hours idle, 62 hours left until respawn
Gate 08: -
Gate 09: World 5, 0 hours idle, 72 hours left until respawn
Gate 10: -
Now you get confused... "Hang on! This was World 5 which I left littered with corpses waiting to respawn! Why has it suddenly changed to World 7?" It gets worse. You THEN start checking the other 6 gates you entered in sequence to find out if they've changed too and, sure enough, they have!
Campfire Competition: I use the above behaviour to my advantage for "loot farming". But can anyone figure out HOW I do that? A roasted Venison Steak fresh off the campfire for the first correct answer. For the vegetarians, a seared Tomato on a stick!
Edit: Post corrected due to getting the idle timings wrong. Sorry folks, the initial assumption was entering Gates 01 through 07 in sequence with a few hours delay between each, so the idle times should have been in descending order. Unfortunately, I went through several versions to demonstrate before settling on the above, and dropped a clanger on the editing. Shows what happens when you surf an all-nighter and decide to stay awake all day guzzling coffee and make up for lost sleep the next night. Web lag, if you like.
