ASTROGATION

Here's a couple of questions for you SW GMs out there.

When do you require the roll for Astrogation? Is this roll made just as a ship is entering hyperspace? After the jump is made, during the trip? If so, how long into the trip until you have the Astrogation roll made?

Who makes the Astrogation roll? The player who's character is acting as Astrogator? Or, do you, as GameMaster, make the Astrogation roll in secret, then play out the results?

And, just out of curiosity, does these new reprints make the change in the 1E Core Rulebook showing Astrogation times in hours? Or, is it still in days?