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Waiting for a 10k x 10k world to pre-generate. How many days....
JaariAtmc
If you don't run into any chunk errors, and there is no one playing on the server, I'd say a few hours.
AetherPirate
Two days. It died a few times, had to re-start it, but it picked up where it left off. Having a pre-gen map really does make quite a difference though, it is MUCH faster to explore.
Rotarycraft and Reactorcraft are awesome. Unforgiving, but awesome.
If this is your server pack, remove client-side mods, like damage indicators.