I am a "nomad", but I usually stay in one country for an entire year. The reason why most people stay 3-6 months is because of visa restrictions, which forces people to do country hopping. I don't have visa restrictions between Argentina and EU, as I'm a resident of both, and so like to stay in one place for a minimum of a year usually, which is long enough to be comfortable, but short enough not to get bored.

I definitely don't imagine doing this forever though. It's stressful, and disorienting (because social circle changes so often, how things work changes often). I'm 29, and already feel like I could really use a permanent home.