Lhogun this question is too brief you must provide more information when asking questions.
I’m going to presume you mean what is reasonable high traffic which is a broad question. You need to evaluate your infrastructure which will include all hardware and links. Also look at what users are doing and what applications are the working with.
I have 13 sites all over the world with a great deal of users and traffic. The placement of VSAT’s, RF, ADSL etc doesnt happen until we evaluate what we will be doing at the site – usage etc that way we can get an idea of the traffic and add the appropriate coms.
If i have not answered your question please provide some more information and i will try again, but if short high traffic isnt reasonable if it is effecting your operations.