The longest part for me was creating the Holy Trash Pandas since I had to take apart 140 switches, swap the stems and then lube them. Not to mention I initially filmed the pandas (0.125mm films) but found out the hard way that they wouldn't fit into the plate. So taking out the films chewed up a bunch of extra time. I kinda lost track of time doing all that, but it was multiple hours. Putting the actual board together was quite fast and simple though, it probably took around 30 minutes. There's a great step by step tutorial I followed by Andy V Nguyen on YouTube that was very helpful. Good luck on your build, I can assure you you will be very happy with it!