How to diagnose IRP_MJ_XXX routine latency?

I’m using a PACS (physical access control system) that displays maps with campus doors and their status.
The maps have some delay to retrieve doors status info, but succeed everytime.
The maps use mshta.exe to display, I cope with a situation where I need to diagnose the latency of executing some IRP_MJ_XXX routines called as dependencies of mshta.exe ?
For that purpose, I’m using Process Monitor and have enabled estimation of task duration.
How to confirm that one IPR_MJ_XXX duration is normal and another one is long ? Is there any time threshold ?
Thank you,