I am a newbie to MVC. I want to know how many routes, can we have in a RouteConfig.cs file?

I’m not aware of any limits on the number of routes that you can have defined. However, it is important to remember that when building routes that a single route can handle so you shouldn’t need to build a number of them that would threaten any possible
limits

You can have as many as routes you want.

http://msdn.microsoft.com/en-us/library/vstudio/cc668201(v=vs.100).aspx

I don’t thik there is a limit on this. To get idea about working with Routes in MVC, have a look at below link

http://www.c-sharpcorner.com/UploadFile/56fb14/working-with-routes-in-mvc-framework/