It depends on the size of the company. The Linux kernel has about 1500 active developers. This is a lot, but many companies also exist that reach this size. I

It depends on the size of the company. The Linux kernel has about 1500 active developers. This is a lot, but many companies also exist that reach this size. I think another thing that matters is how you store branches/code under review. In Linux, each team/person has their own repo. The main "Linus" repo has mostly the finished code. In a company it is much more common for everyone to store their unfinished code centrally. Perhaps this also accounts for some increase in size.