Well... I think it depends. I had a knife with exposed pins that I took up once and Mr. Howard took it right then and worked on it while I watched, but I wouldn't expect that (it was during the Rendezvous, I believe). I think it's mostly you send in the knife with what you believe needs fixing, they look it over and let you know they received it and sometimes a general timeframe, then they work on it when they can.
GEC is definitely NOT like Zippo in that Zippo is a huge company with a whole warranty department, I would think. GEC is a small company with only a handful of employees. They are extremely skilled at what they do (believe me, if you get a chance take the tour) but they have to work on the scheduled runs first and do warranty work in unused time.