Just to offer a counter-point to something that is said a lot in response to the OP's question:
Your absolute minimum time between system entry and system exit is ~20 seconds. There is some flex here, but it's not really worth grinding on about.
Why people think that they need a fuel scoop that runs much faster than that, is something I have a hard time processing. It took me a depressing amount of time to get some of the frequent posters in the Exploration forum to finally realize it, but only some of them. Hopefully, people elsewhere are better at seeing what is actually happening, and what benefits they are actually realizing, instead of just looking at the kg/s on the scoop.
An Anaconda, with the standard fuel tank can use a 5A, and top off easily between jumps. This would be the minimum for smooth sailing, but not the optimal choice. The below comparison is both for topping off after every jump, and an empty-to-full scoop session.
From Coriolis:
5A - ~9M credits, 55 seconds from empty to full
6A - ~28M credits, 35 seconds from empty to full
7A - ~91M credits, 25 seconds from empty to full
7C - ~6M credits, 35 seconds from empty to full
Now...which one do you think is the optimal choice?
The only actual benefit to getting a 7A is the fact that you can have a higher scoop speed while being farther from the star. This is a nice benefit, to be sure, and offers a larger safety margin, but I would say that it's hardly necessary.
Also - you have to add quite a bit to an (Engineered) Anaconda to appreciably lower its jump range. Unless you are going to the extreme fringes, there really isn't much difference between a 50 and 53 light year jump range. The point of diminishing returns is actually around 40 light years.
Riôt