Without realizing it, I've broken my record of the longest time I'm in a fulltime job. At McCann-Erickson I worked 2 years. And in the midst of January I already passed that. I once read that 2 years is actually the average time a creative works at an agency.
I can imagine why. Agencies are changing so fast that every year is different. It's what makes advertising a very exciting, but also a uncertain place to work. Moreover, it pays off to switch jobs, both financially and status-wise. I started as an intern at Duval Guillaume because I did the Miami Ad School at that time. And no matter how many times you tell that you have 5 years of experience when you worked in Holland, people rarely see you as a full senior.
Soon I will go to another agency. At the moment things are a bit uncertain (it's not even sure if I'll stay in Belgium) but I'm looking forward to make a fresh start again.