The number of PTP requests per port per second will depend on which profile is being used. If you are using an end to end configuration, the port will be capable of handling the same number of requests as NTP (7500 packets per port per second). This allows you to synchronize with up to 7500 PTP clients.
If you increase the frequency of packets sent to 2 packets per second, then the number of requests per port per second will reduce to 3250 (7500/2) resulting in you being able to synchronize with up to 3250 PTP clients per port.
If you are using the peer to peer settings, then a Tekron product can theoretically handle an unlimited number of packets per port per second. This is because the clock port will only be synchronizing with the switch it is connected to, and the switch can theoretically synchronize with an unlimited number of devices/switches.
It should be noted that an NTP port will be able to synchronize with a fixed number of clients as limited by the hardware and software of the time server. For Tekron products this value is 7500 NTP clients (equivalent to 7500 packet per port per second).