Leveling in WOLTK Lordaeron realm comparison

So, it has been crazy long since I've played WOTLK and I was wondering how long x1 would take from 1-80 on average? I'm not sure if I have the time and I'm just interested in raiding again, so I'm unsure whether I should pick one of the x7 servers or just stay with Lordaerons

That depends on how well you have a grasp on the leveling process. The average player, no-lifing the game, would probably take a week and a half to two weeks to reach a higher level on Lordaeron.