Thanks for checking it out!
In my tests, the two decks were necessary because you burn through a lot of cards even in just a simple round. The number of cards in the deck doesn't dictate the length of the game as much as what cards are drawn to create the border. There are a lot more normal (Stash) cards than one might think, and having two decks makes the face cards less concentrated. Even then the best way to control the pace is the GM. If the GM chooses to keep the risk low/reward high, that's the easiest way to speed up (or pace) a game, as the players do not burn a lot of stash and can use them for big dice pools.
I hope what emerges from the one page RPG is an irreverent and not-so-serious parody of Blades in the Dark, so wild extremes are a welcome feature if they happen. I would hate for it to seem too long, however, and if there's ways to shorten the game accordingly I will certainly want to look at them. Thank you for the great feedback.
If you get a chance to play it, let me know!