And they have covered quite a bit of ground.
Fans will remember at the end of "Return of the Jedi" there is a big Ewok orgy and general party, YAAAAY the Emperor is dead!!.
The next day Luke Skywalker is returning to the fleet, still suffering from the effects of the Emperors force lighting, when a message droid (think big assed engine with a compartment for the message) drops out of light speed. It is for the Emperor, sent to his last known location, by the planet of Bakura. An Imperial outpost on the edge of unexplored space that is under attack from an unknown aggressor.
So begins the first post Star Wars movie book "The truce at Bakura" Followed by 80+ books spanning over 40 years. And yes I have and have read them all.