The shrinking scale of the Star Wars film universe

In my reviews of The Force Awakens and Rogue One, I complained about how the speed of communications and hyperspace travel seems to have shrunk the Star Wars universe. I asserted that the writers seem to have no appreciation for the size and scale of this universe, or for galactic conflict. That observation severely hurt my enjoyment of both films. Star Wars has always flown lose with its science, but even though the original trilogy got a lot of details wrong (ahem, "parsec"!), there at least seemed to be an effort to respect some scientific believability. Even the prequels stayed fairly respectful to the size and scale of the universe and conflict. The new movies, by comparison, seem completely (and deliberately) scientifically illiterate.

Keep in mind that the following analysis is coming from someone with only minimal knowledge of the extended universe. I'm more of a Trekker than a Star Wars fan (a "Warser"?). I have tech manuals of the Enterprise and the star charts of the Federation, but no Star Destroyer tech manuals or Imeprial star charts. So my opinions come from the films alone. Besides, all those novels, video games, and comic books have been de-canonized by Disney anyway. If anyone more knowledgeable of the Star Wars extended universe wants to chip in with corroborating or conflicting information, feel free to do so in the comments. Thanks to Disney's meddling, such knowledge may now be moot.

And oh, by the way, it drives me nuts when Star Trek movies make these sorts of mistakes as well. I'm looking at you, Star Trek V and first episode of Enterprise!

Hyperspace originally analogous to contemporary air travel

Let's start by looking at a frame of reference: the trip in the Millenium Falcon in the first Star Wars movie. While the Millennium Falcon is in transit from Tatooine to Alderan, Luke has time to receive some rudimentary Jedi training from Obi Wan, Han calmly relaxes and socializes in the lounge, and Chewbacca has time for at least one game of space-chess against the droids. This hyperspace trip is presented as being analogous to cross-continental (or intercontinental) plane flight: at least enough time for passengers to unfasten their safety belts and wander around the cabin.

A hyperspace trip in the Millennium Falcon offers at least enough time for everyone to lounge about.

But an estimate of hours is on the low end of the spectrum of possibilities. As far as I can tell, there's nothing in the movie that negates the possibility of this trip to Alderaan taking days. That would certainly be plenty of time for Obi Wan to teach Luke enough of the basics of Force-sensitivity to enable his "lucky shot" in the climactic Death Star trench run. It would also give the characters enough time to socialize, converse and develop some sense of camaraderie with one another. It's also enough time for Leia to undergo at least a couple rounds of interrogation aboard the Death Star...