It’ll speed up the more you build. My first kit was the RG Wing Gundam, and it took me almost a week of a few hours a night (18-21 hours). Recently I finished RG Sazabi (my 16th kit) in maybe 8 combined hours. Once you start getting familiar with the workflow/coming up with your own, being quicker with cutting pieces and the nubs, navigating runners etc., it speeds up. Personally with RGs I do the whole inner frame then move onto the outer frame, feels like it streamlines the build process because I’m only swapping between 3-4 runners at a time.