I'd suggest to contact your sales rep or SE in order to work with them on getting this information. There are so many factors surrounding sizing and performance that giving even a rough figure might be wrong.
I send this questions to my "sales rep" more than 4 weeks ago and have no any answer at now.
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MWG performance is measured in Request/Second, not in simultaneous connections, number of users or bandwidth. That's why questions like that are not really easier to calculate. For example, 1000 Requests/sec could be anywhere between 20,000 to 70,000 users or 80MBit/sec.
The only way to be sure is to measure current activity from existing logs to properly size the environment.