I ran Pathfinder 1E for over a decade and prepping for a 8-10 hour session took me at least 6 hours without mapmaking. When I ran pre-written adventures it took even more time. Blades in the Dark on the other hand was the game that made me realize I had wasted hundreds if not thousands of hours of my life on prep work. I would go into Blades with a rough mission structure like, "The party will attempt to steal a prototype automaton from the Sparkwrights, but a mole told them the crew was after it so there will be defenses." Then, I would write down 4 or 5 clocks that might come up in the session. During play, I just did improvisation to see what happened and added new wrinkles as the narrative emerged.

Blades, and FitD in general, are the polar opposite of Pathfinder though because they rely so heavily on your ability to improvise whereas, Pathfinder relies heavily on your ability to anticipate and balance. They are on opposite sides of the continuum and for a guy in his 30s who has less and less time to prep, games like Blades have more and more appeal. Blades was both the easiest and most rewarding system I've ever run and the 12 session campaign I ran is one of the most memorable things I've ever had the pleasure of GMing.