What is message poll time in indirect messaging ?

I am using XCTU with two 900HP(200k) modules connected to a PC. They are sending messages to each other with DH:DL set to the other address. One of them is a “Indirect message coordinator” and the other is a “message poller” working in asynchronous sleep mode.
It takes around 5-6 seconds for the sleeping device(once it wakes up) to poll an indirect message from the coordinator. This is a very long time that module needs to be in “non-sleep” mode to check for indirect messages.
What is the minimum wake up time for the module to poll message from the coordinator ? Are there any settings that influence poll time ?

Try decreasing the NH parameter to 0 and see if that shortens the poll time.