BQ76PL455A-Q1: PL455 wake-up time interval problem

HI expert,

BQ76PL455-Q1 was used in customer side. Customer has some question about delay when BQ76PL455 was used for cascade.

In section 7.4.5 of the datasheet, when multiple 455s are required to be used in cascade, there is a delay from when the WAKE UP signal is sent to the start of communication.

Question:

This time is the time requirement for communicating with the last 455 or the time requirement for communicating with the first 455?

In addition, is there an upper limit for the time interval from WAKE UP to 455 communication? If there is an upper limit, what is the recommended value in ms?

Best Regards

Songzhen Guo