The loading times are based on many factors including platform architecture, processor speed, other apps running at the same time, amount of memory, etc... They are going to vary for everyone.
I think we should have IL leaderboards and a hardcore leaderboard only.
Uh, I don't know what NG stands for, but I thought one was for level selecting each level individually and one was for playing through all levels on hardcore mode... Maybe I'm confused.
Actually he makes a good point simply because many levels can be completed significantly faster by taking advantage of strategic deaths (e.g., die at a spot that resets the obstacle to a perfect spot instead of having to wait 5 seconds for a revolution). However, I think until it becomes a problem there is no need for separate leaderboards.