Correct, that's exactly what I'm talking about. A ship will always eventually need to put in somewhere to refuel, resupply, and repair any damage suffered during the course of its mission.Correct me if I'm wrong be it seems like you're talking about self sufficiency on the level of a ship that can make they're on Dilithium, make their own food, make their own deuterium, make their own antimatter, make their own duranium and anything else they might need without any outside influence what so ever. Thats never going to happen.Which goes back to what I originally said about Federation starships not being that self-sufficient to spend years and years in space without any help.
I don't know where the 17-year figure came from (maybe it was a typo), but I was simply responding to the post.And that E2 enterprise (if I'm remembering the episode correctly) lasted longer then 17 years by far. If I remember right it was 180 years.
At this point, it becomes an issue of "what do you call self-sufficient?" or rather "how long can a ship stay in space period?" Inevitably, any spacecraft that can be continually maintained and supplied can stay in space indefinitely. But I don't think there has been any Federation starship design that is totally self-sufficient and can leave Federation space for 5 or 15 years without having to periodically put in somewhere for a pit stop. They're not designed to run for very long completely on their own. Both the generation ship Enterprise in "E2" and the Voyager--regardless of the technological span between them--both could only get by as long as they could with help from others.Even with help along the way thats outstanding. Now take voyager who has had what? 2-300 years of technological progress? I am not seeing why this is a difficult concept. But then I don't personally see Self Sufficiency as meaning complete and total isolation from anyone they meet along the way.
As I said earlier upthread, I would suggest that any multi-year deep-space exploration mission likely involves periodic returns to Federation space for supplies, repairs, and regular crew rotations.