My projects tend to creep in complexity as I go along. What starts out with a resolution to finish a build within a few weeks usually ends up twice that after I decide to add this and change that. Often, I tell myself at the start that I'm going to stick to a "stock" build in order to keep completions and interest going at a good rate. I even sometimes have the wild idea of sealing the hood on a project and making it a curbside to finish quicker, but that has yet to happen. Typically, scratchbuilding rears it's head and another kit (or 2) becomes involved and the time-anchor comes out. Also, I wouldn't want to guess the percentages but I'll bet many here are like me when it comes to part cleanup. I spend hours and hours doing parts cleanup, including parts that I know will NEVER be seen by anyone but me. Maybe it's the inner dentist in me taking over, so I do it, but then wonder why. Bottom line is you work at a pace that feeds your creativity and time availability. Fortunately as we get older we tend to have more of each.