Taking a guess here, you mean 900+ LY (the maximum is 1,000 LY) and if you chose the economic route calculation then 361 jumps sounds about right for a dense area. Switch to "fastest route" for fewer jumps but be aware of scoopable stars (or lack thereof). Make sure that at the point where your fuel ends, the star is scoopable and you'll be ok. The star after which your fuel ends will have the plotted route with dotted lines. Hope this helps.
I assume that's an Anaconda.
That was a bug during the Engineers Beta, was fixed for release. Perhaps the mini update has reintroduced it