How do I get AEGP time_step

I am doing an AEIO export of 23.976 frames per second, 40 frames. 

I call AEGP_GetOutSpecFPS() and I get the expected frame rate. 

I call AEGP_GetOutSpecDuration() and I get a duration.value of 5000 and a duration.scale of 2997.

I have seen this in QuickTime where the time scale is 2997 and the sample duration is 125 for 23.976 frame rate.

How do I get the equivalent value for After Effects rendering "time_step" so I can convert a duration.value of 5000 to a result of 40 frames?

I can not figure out how to get the After Effects "time_step" in my render module at the call back My_StartAdding() time? 

Obviously I need a "time_step" of 125.