In the detailed output directly after termination of the integration process there is (outputted to the Pocess Console) indicated the number of images.
Also when you open the integration file and execute Image/FITSHeader, you will find the value of 'ImageIntegration.numberOfImages' as well as the parameters used for the integration process and scale, location and noise estimates, image weight, scale factor, zero offset, rejected low and rejected high pixel numbers for each subframe. However there is no information about subframe exposure time or total exposure time.
Bernd