I took a trip out to the Horsehead Nebula earlier this month. It was a two week trip, but I was going cautiously as I was a first time explorer and still a little nervy, and at first I was scanning everything in my enthusiasm to get my name on some astronomical bodies. On the trip out I didn't discover much, and quickly realised that people would be heading for obvious "landmarks". Took a more circuitous route back and found a lot of undiscovered stuff.
To pass the time I started off listening to music as I flew, and when that got old I listened to an entire audiobook.
I did start to go a little stir crazy towards the end. I didn't see another commander in my entire time out there. I started to fantasise about coming in to a welcoming station to dock, being able to set down on a landing pad, being able to leave my craft (I know the function isn't implemented yet, but I RP that I leave the ship when I dock).
Selling the data when I got back was glorious though. I insisted upon selling each system one by one (took me a full hour), saving the most lucrative systems for last. It was a real buzz to be acknowledged as the first time discoverer of something, and I raked in 4.5 mill from the trip.
That said I don't know if I can face getting back out there again so soon, though I figure I will have to at some point if I want to make Elite explorer rating.