A reasonable estimate based off of my previous experience with the DoD patch is "within two weeks if I don't slack off, one week if I really crack down and rush". I don't need to do much more translation since I already have a basis down, so that saves a LOT of time. All skills and most equipment I already had done, so it's stuff like materials, the last couple of equips I didn't translate, and item descriptions and whatnot are all that'll need translation. I can't work on it much more today until my charger comes in, but my goal today is to get as many item names done as possible. Mind you this is without doing images and whatnot, which I want to do but I know given my crappy Photoshop skills won't be done for uh... awhile, not that I could translate a whole lot other than, say, the menu and map names without it getting into the territory of "oh god I need to edit around this background help it's too complex oh god why". I also have another full update to upload and half of another done but I'll probably wait on that, it's just the one for the Pyramid which doesn't have too much interesting going on since I'm waiting out on the boss until I finish the other dungeon.
tl:dr- One to two weeks if I really put the pedal to the metal.
EDIT: Speaking of the DoD patch, while my focus right now is NoR, I will be trying to see if I can't work on the Banquet version of Devil of Decline and get that going. If I can, that opens up every .TARC using game (Touhou Quest, Nightmare of Rebellion, Marisa's Kirisame Magic Shop, Devil of Decline ~ Banquet and Phantasmal Summoners 2).