Here is an update on a 19th century frame I have been working on (http://forthillstudios.blogspot.com/2011/07/applying-compo-ornament.html). Gesso has now been applied to the ornament.
It's not that these processes are that time consuming individually, but in order to have some semblance of a rational work flow, I try to group tasks (and I was making and applying gesso that day). And of course, since it is my own property, it can sit in storage for quite a while before getting worked on.