Bob usually stops by the Vacuum Infusion demo during AirVenture so we get a chance to catch up.
That said, there are a lot of builders that are well beyond that 10 year mark as well as some that have brought it in under a year.
They guy I typically fly to Oshkosh with built his RV in less than 9 months. Another guy in the chapter is still working on his Berkut. He's the original owner of kit #8.
It's all about man-hours not how long you've owned the parts.