What was your longest session playing this game?

I've got the game and played for around 10 minutes. Decided to invite my wife to play it with me and bought her a copy. We started at around 7pm.

We've played, unlocked some techs, automated some production and had a blast. A couple of hours in game (or so I thought) I said "Hey, how about some food?". We then noticed how bright the room was. And how bright the light coming from the window was. It was 6am. Neither of us realized it. We sat through the whole night playing the game.

We paused, and went to work looking like zombies. Worth it.

This was years ago, and after countless hours I still play some long stints. So I was wondering, what was you longest session playing it? I see some pretty damn huge bases in this sub. You guys are impressive.