It's actually not that bad. Farming 2000 Light meant 83 runs of non-bonus ST/WoD. Add in bonuses here and there, one could potentially do it in 40 hours or so, maybe. Someone (a regular office worker) in my FC finished the Nexus in like two weeks by always chasing bonus content. It takes some dedication but if you don't look at the goal, just keep progressing it's actually quite quick.
(...says the guy who's been sitting at less than 200 Light for 2 weeks...)