I'm literally telling you that emergency burn isn't even necessary. And as another comment said in another thread, it's impossible they're always an annoyance. By pure statistics you're going to have same helpful ones, some less so. Unless you deliberately go against them each half of the cycle.
Here is the actual map. Assuming that player is in the core worlds. Unless you are going exactly into south-western direction you will have to cross some slipstreams. However, players normally tend to avoid furthest corners and pick missions in the closer regions. This way,
most of the time slipstreams will be the hindrance and only
on rare occasions they will be of use. Needless to say that to get this map I had to go into two pirate base systems to use their sensor arrays to gather this data. Also I had to remember that some while ago Alex did a blog post about slipstreams changing directions on a regular basis. And I still don't know exact timeframe for that so on average I have roughly two month without slipstreams, 5 months for the eastbound structure and 5 months for the westbound one. And to get a map while maximizing useful time I need to be in any of this base systems, waiting. And, while we at it, as a mean of slipstream navigation Neutrino detector just sucks. Why would I need to know a vector to nearest slipstream? I need a map.
The whole system is too complex and with so little key information available in the game its just opaque. Why, just why it was so difficult to create a sector wide message that hints about slipstreams going away and coming back!? And put the quote from the blog right in the Hyperspace Topography screen? Why, instead of useless Neutrino detector feature we didn't get some means to actually chart the hyperspace maps? It costs freaking skill point after all. Like the ability to control most powerful battleship in the game. Also the detection range from the arrays is a joke. Apart from Samarra, core systems can be completely or partially out of range.
And this is coming from the player who actually read that blog post about slipstreams. I'm afraid to think about someone's else experience who don't.