I have this project which required using existing DCP but I had to add burned-in subtitles.

The original unencrypted IOP DCP was 410 GB in size and was divided into 14 reels. It run for 4 hours and 15 minutes.
I used the subtitle xml files with timecode that were included in each reel of the original DCP to create a local version of subtitles, and then I created 14 new projects in DOM for each original reel and imported the original files plus new subtitle files.

Once this was accomplished I created another DCP project and imported those 14 new DCP’s , and this time set an option of burning-in subtitles on each reel.

When I hit create DCP, DOM calculated the needed encoding time as about 800 hours. However I have noticed that the progress indicator moved much faster than the estimated time would suggest from the beginning, as it transcoded about 11 percent of the project in about 15 minutes.

This morning I checked the situation. The project was finished and the final run time was 7 hours 21 minutes and 11 seconds.

I am just letting you know this, as one probably could not expect DOM to be a 100 % precise in those estimations.