Concurrent user connections to vCenter

hi,

we have around 50 virtual machines on our infrastructure with 5 ESXi 5.5. hosts. They are all Windows 7 machines and users access them via vCenter console (they cannot use RDP sessions for different reasons). Now I would like to know how is this handled by the vCenter? Can this lead to some sort of overload on vCenter server or can it lead to some other performance issues? There are about 15 to 20 concurrent connections but about 50 in total. I couldn't find any documentation on how many connections could cause the vCenter overload and any meaningful explanation would be appreciated.

thanks

DB