Last weekend we played with the “basic” rules and wrapped in 30 minutes/player, which is Agricola-speed. But there was about 30 minutes of rules up-front. And now my head is swimming with the extra depth (but not length, per-se) you get by including rules for “support” parts for your rocket like generators and reactors and radiation shielding. We’ll probably play with those this weekend.
And then after that, the gigawatt thrusters which have to be powered by rare isotopes harvested in-situ out in the asteroid belt.
And then after that, mobile colonies, and near future sci-fi colonists to live on them, so you can manufacture terawatt thrusters that will take you out past Neptune…
I actually have the old Eagle-Gryphon version, too. They changed the deck composition a bit in the new edition, but it’s been years since I played anyway.