Not sure if
any station could survive 30 days unattended, IMHO. At least against players. Against AI I think the goal would be indefinite survival.
But that does raise another interesting aspect of securing a station: Distancing yourself from threats. Most people don't go too terribly far out of their way to find stuff unless everything nearby has been picked clean. For every system you jump away, you're increasing the potential search volume by an absolutely enormous number of sectors. 8 systems out from spawn, the search area is functionally 2,097,152 cubic sectors. 16 out is 16,777,216 cubic sectors. 32 systems is 134,217,728 cubic sectors (granted the areas near stars could largely be ignored but even then, you still might have to search them if your enemy was particularly crafty with a planet segment or asteroid). Every time you double your distance you octuple the search volume. Since systems aren't, by default, revealed, until the system your station is in is explored they won't know which system your outpost is in. And once they do, they still have to search every station within the system to find yours (which means derelicts and pirate stations and stuff are
technically defensive features). That's actually part of the reason I never reveal my outposts existence except on a need to know basis. After all...