1 Gbit / s line for how many employees?

1 Gbit is 125 MB per second of data transfer performance.

For a company with how many employees is this management appropriate?

P.S. Some private households already have 100 Mbit / s but they also watch Netflix!

What kind of company are we talking about?

A symmetrical gigabit line will easily be sufficient for any normal company even with several hundred employees, unless they do something special that requires huge data transfers.