Effect duration - AE filter in Premiere

I am working on filter plugin for AE and Premiere where I need to know the effect duration. in_data->total_time corresponds to the total clip duration, not the effect duration. If the clip is trimmed at start/end total_time not match the effect duration.

AEGP_GetLayerDuration return the right value in AE, but not works in Premiere.

AEGP_LayerH currentLayer;

A_Time layerDuration;

ERR(suites.PFInterfaceSuite1()->AEGP_GetEffectLayer(in_data->effect_ref, &currentLayer));

ERR(suites.LayerSuite1()->AEGP_GetLayerDuration(currentLayer, AEGP_LTimeMode_LayerTime, &layerDuration));

Is there a way to get the effect duration in Premiere?

Thanks.