Take an exposure, it should tell you how long it took to download. If you take a few, the average should be updated each time to include the new times.
After the first image, the estimated download time has a value so that the next time an image is taken, in the Capture module it should display the amount of time remaining in the download after the exposure is complete. That time should decrease in 100 ms intervals until the image has downloaded.
Start a sequence. On the summary screen, the estimated download time should be included in the timer for the image. It should also be included in the time for the sequence and the overall time to completion for more accurate timing.
Please verify that the changes to the estimated download time help the Scheduler and don't cause any problems for it. I would expect that a more realistic time estimate would help the scheduler, but I don't use it that often and I have not worked with that code so I don't know.