Adventure with a lot of planning

Hello, everyone!

I have a couple of players, who really enjoy planning everything perfectly. Most of the time it feels like tardiness (once they literally spent two hours trying to comprehend 70 years of historical data from spaceship's logs. Wow, guys, just wow!)

I want to try and prepare a session, where they can spend all their time planning and trying to prepare to some event. Best idea I have is a bank heist scenario, but maybe there is something better. Have you tried something like this? Maybe you have cool ideas on what the players can try to prepare for and how to make it enjoyable?