Docking was one of my first real attempts since getting back into KSP, so I wasn't (and still am not) especially efficient at or knowledgeable about Kerbal rocket science. I just had what I thought was a cool idea for a space station after watching someone else doing their first time docking, creating a rather crazy looking piece of work. ...My design, as it turned out, was questionable at best. I got the first two pieces up fine and had little problem aligning their trajectories, but RCS was set up terribly for docking. Using docking controls, the module would just start spinning at the slightest correction burn. Extremely frustrating stuff, that was. Eventually (about an hour or two later), I'd pretty much given up careful precision and was just about out of monopropellant fuel, so as I drifted around at an angle with the ports facing, I just launched at it desperately. Unexpectedly, the two parts pulled towards each other fairly quickly (as I said, next to no knowledge here) and started rolling around dangerously close to flying off from each other. I just stared, wide eyed (quite a feat considering I was half asleep and it was about 2 AM) and scared to do anything in fear that I'd ruin it, and watched. Slowly, the scene calmed before me and suddenly the view rotated and zoomed out a bit, informing me that there was a successful connection. So what if it was horribly lined up? So what if it turned out to be horribly unstable and hard to maneuver? I was so full of accomplishment at the time that I could barely care the least for that stuff. That sort of feeling is not something I think I've gotten from another game before, at least that I remember, and it's definitely something that makes Kerbal Space Program special to me now. Hopefully the first in a number of successful achievements. Edit: Err....so yeah, time. I'll say a few minutes to get them within 500 m, two hours after that 'til they were officially docked.