This really depends on the projects / companies people are involved with as well. Especially on the front-end, it is very common to take a project from start to

This really depends on the projects / companies people are involved with as well. Especially on the front-end, it is very common to take a project from start to post-launch support in a year, especially in a "non-tech" company. Staying after that in a lot of these cases mean a lack of interesting projects, and also end up with stagnation. My experience may be a bit affected by freelancing though :)