We have done and are doing fairly complicated
projects (involving 10-20 team members in a project over a
period of more than a year). The number of lines of code varied
anywhere between few thousand lines of code to more than couple
of million lines (however it depends on what type of code/system
you are referring to .NET, Java, C++, C, OO, Assembly, Oracle,
FoxPro, VB, etc.).
