I have done it tons of times and it takes me about 2h pretty consistently. It is the last thing you want to do after a long travel. If you have some sort of bare bones bike that's not useful for nothing from my perspective, you can run some sort of exercise for UTube, but I am talking about my normal life. I also have a Brompton with all kinds of similar complexities and it takes maybe 7 min for about the same goal.
Well, when I had my NWT (1x11) I did it in less than 30 minutes even after not doing it for months. Don't know what to tell you. I also have friends with NWT's who can do it faster than I. Split handlebars helps. I did have the color packing process photo chart i made (mostly for TSA) to help me remember. I guess we move at different speeds.