Speed and send times for CAN-BUS communication with 4 modules (Arduino + can bus shield)

I have doubts about how to configure the CAN network, when using the atachinterrupt function only 3 nodes can communicate, when using more than 3 what is the way to establish the communication? I have made multiple tests and when reading the main data bus the sending times vary. Someone who has connected multiple nodes can help me please. :pray: