I wonder too, and I do not know. From some developers I've worked with in the past, they ask their colleagues a lot, try cut & paste until it works and ask det

I wonder too, and I do not know. From some developers I've worked with in the past, they ask their colleagues a lot, try cut & paste until it works and ask detailed questions on StackOverflow or similar sites. The bigger the team the longer they can stay with the company until they are made to leave. In some very large companies I've worked with, with large teams, they stay forever even when colleagues are unhappy with their performance. In those companies it is often more important to have all positions closed than have (good) developers in every position. When looking at CVs - not scientifically - some stay only some months with a company or stayed for a long time with a large enterprise.