Capabilities of FG-60E

Hello, everybody!

I have customer's request for a firewall replacement. Now they use an old Unix machine. I contemplate to offer them FG-60E, but not sure about how many users in a office could this device serve.

I've read this 

https://www.fortinet.com/...rtiWiFi_60E_Series.pdf

and didn't find the information I need.

Could you please tell me how much users can FG-60E support?

Many thanks in advance,

Ilya