I think it depends how much someone plays Elite. If someone plays like a few hours per week, it takes him forever to get anywhere, while a dedicated player can get to the edge of the galaxy in 2 days. My longest out has been about 2 weeks, but I must have spend at least 100 hours or so on that trip. A player who only plays like 2 hours a day/14 hours a week would have taken 2 months for the same trip. While I would like to spend months out of the bubble, it just doesn't work for me considering how much time I spend in the game

Sometimes I do some breaks of maybe a couple of months though. How active do you have to be so it counts? Because I didn't play Elite for like 6 months and my ship was parked about 15k LY from the bubble, does that count as having been out in the black for 6 months?
Edit: What I was trying to say is, I know it's easier to count weeks or months, but it would make more sense to count the hours spend playing the game in the black. Instead of counting like 2 weeks inactivity as having been out that long.