Maybe I'm just too critical as an astrophysicist, but I'm wondering if there's any official canon regarding how strong is too strong of a "gravity well" for safely jumping to hyperspace in Star Wars?
I think of the jumps to hyperspace I've seen in the movies and many of them occur pretty close (at least what I would call close) to planets, where the gravity from the planet is still relatively strong. It looks like many jumps to hyperspace occur at about the same distance above the planet as the distance of the planet's surface to the planet's center, where the force of gravity is a quarter of the value as at the planet's surface, smaller but not insignificant.
Even if you get far away from a planet before jumping to hyperspace, there's still the system's star's gravity well that you're in.
And even if you get far away from that star, you're still in the gravity well of every other massive object in the universe. These gravity wells are weak since the objects are far away, but they are still there.
Thus my question: how strong is too strong for a gravity well to be unsafe to make a jump to hyperspace?