Greetings Xaldafax,
I think there might be some confusion in terminology that is adding to the confusion in this conversation.
In colonization, an "Outpost" is actually one of 6 types of small space station, labeled as "tier 1" and having only small and medium landing pads. To build an outpost as an initial starport in a system, roughly 17,500 tons of goods are needed. A typical Type-9 build (with shields) can haul 752 tons of cargo per trip. Thus an outpost takes around 24 trips in a type 9 to be completed.
It sounds like you are building a much larger station. I've personally build one of the tier 2 stations as the initial starport. A tier 2 station requires around 70,500 tons, which works out to be about 94 trips in a Type-9. This might be a tall order for a casual player, but potentially doable in 4 weeks.
If you are building something that takes over 175 rounds trips, you must be building a tier 3 station, which in my opinion is absurdly huge and costs too much. Solo players have completed tier 3 stations, but none of them play casually. I think FDev needs to put a warning on any tier 3 station that says something like "This station takes a huge commitment in time, and is meant mostly for groups of players."
The time extension you request is a hotly debated feature. Building a tier 3 in 4 weeks is a huge undertaking, and honestly it needs more time. That said, the reason there is a time limit is so that players can't claim a system for the sole purpose of blocking another player or faction from claiming it. With that in mind, the initial station does need some kind of time limit to prevent griefers from indefinitely blocking systems. If FDev doesn't reduce the goods needed for a tier 3 station, then maybe 6 weeks is better than 4 weeks?