A long time. A lot of what I've read people are using it to create new software/code. The majority of time spent on an app running for 5-10 years isn't on writi

A long time. A lot of what I've read people are using it to create new software/code. The majority of time spent on an app running for 5-10 years isn't on writing new code. There are large areas of code just working perfectly that nobody has touched in years. Then a feature request comes in for that area and the majority of the time an engineer spends is reading and understanding the code and the new feature. It might just be a couple lines of code changes but several hours of discussion and understanding.