If you run it as lan, one player will still have to be constantly afk, and doing that is, as somebody once said, a skill, not a convenience. So if you're doing something like that, you might as well not LAN and just leave the world open somewhere.Don't care about the not playing bit and having it stop. But if I wana pump lava from the nether into a tank in the over world, can a chunk loader in ssp keep said nether chunbks loaded while I'm in the over world , and have one in the overworld so it will work while I'm off in god knows where? Will they run in ssp? Or lan? or not at all unless I run a server?
And yes, a chunkloader in the nether would keep the chunks loaded in SSP/LAN.
A server would solve your time problem though.
Now I have a question of my own, what's the difference between the third-party map forum and the map forum?