Normals
The normals for me take roughly 5-6 mins for a slaughter. The benefit for normals is the speed in which they can be completed with a bot. These drop the weakest loot type 1 augs, and if you are grinding points or AA's, normals is the way to go.
Hards
The Hards are hard. There is no doubt about it. The problem with the hards is the amount of time it takes to kill a hard compared with the sub-par amount of points in return. It takes anywhere from 20-30 mins for a hard with a geared group and 30-45 for a normal group.
The problem I see with the LDON system is the insane amount of grinding it takes to get points through this system. You can do 5-6 normals in the time it takes to do 1 hard with minimal risk of death. The hards need to be increased point wise. I only do the LDON's for experience for my alts. It's the best exp I can find, but found the hard's don't really give more exp than normals either. There truly is no point to do Hards except to challenge yourself.