It's been released for a while now:
viewtopic.php?f=15&t=2776remix has made a few minor tweaks to the editor so I can do it faster based on my own work flow, once you get used to how everything works it doesn't take too long but map editing is more a artistic talent than say database work, time spent shouldn't really be your priority over getting it how you want it, in mapping the quality of your work and the 'feel' of the map counts more than time spent on your map