What is the expected latency from one PPS to the NMEA ZDA telegram on the LD5?

The latency will vary, depending on LD5 Variant.

For A Variants of LD5
The typical latency observed from the 1 PPS to the NMEA ZDA telegram output is around 400-500 msec.

For B Variants of LD5
The typical latency observed from the 1 PPS to the NMEA ZDA telegram output is around 400 msec.

For C Variants of LD5
The typical latency observed from the 1 PPS to the NMEA ZDA telegram output is around 300 msec.