Like many here it varies. I take breaks between detailed builds to knock out a Dave Deal or Tom Daniel build. Then go right back at a full detail build with all the bells and whistles. For me it's tough to do "Obsessive" detail builds for every kit that comes across the bench. It also depends on the vehicle. A Top Fuel digger or Funny car just begs for ignition, fuel and other goodies. But I don't think I've built anything in quite a while where I didn't scratch build a piece or two or at least add ignition wiring.