Scheduled shuttle calls [Small Feature]

[DJ-Fireball_did_this]

Hm, I can see it from a functionality standpoint, but from a lore standpoint I think the emergency shuttle i supposed to come as quickly as it can, since it's a shuttle called to evacuate because it's an emergency.

Of course, who cares about the lore, if it's a good addition, we should add it!

Presumebly the idea is "if you don't hear from me in X minutes, assume I'm unable to respond and call the shuttle". Also, during this the shuttle can probably be called at any point.