Most wireless access points and wireless routers can theoretically have
255 devices connected at a time. That represents a lot of computers,
smartphones, tablets, cameras, and other devices and probably far exceeds
the needs of the typical home. However, just because you can theoretically
connect 255 computers to a single Wi-Fi router/access point doesn’t
mean you should.

Keep in mind that each computer or device that’s added to your
network will reduce the bandwidth available to the other devices using the
same Internet connection. That’s because all these devices are
sharing not only the same wireless network, but they’re also
sharing the same Internet connection from your broadband service provider.
In this case, the bottleneck isn’t necessarily with the wireless
connections, but it’s with the amount of traffic or bandwidth that
can pass through the Internet router to your broadband service provider.