No digital audio system is “instantaneous”; the term “latency” is used to express the time by which the audio is delayed in travelling through the system. In practice, latency only becomes a problem when mixing signals from systems having significantly different delays. The Dante protocol used by RedNet exhibits very low latency, and you should not experience any problems in normal recording practice when using it for multichannel audio transport between a DAW and sources or monitoring.
The precise latency of any given system will be determined by multiple factors, including the processing speed of the computer, the number of switches in the network, or make/model of switch used and the network topology.
If you are using Dante Virtual Soundcard instead of the RedNet PCIeNX card, the computer requires additional processing time.