What version of Skyline are you using? (Help > About)
There are no attached files, but for files larger than 50 MB, you will need to post them to:
https://skyline.ms/files.url
Please ZIP any Waters .raw data folders.
Yes, 12 hours is way beyond anything we have seen ourselves and would be highly interesting to understand and certainly we would want to get it down below 30 minutes for just about any single file.
Thanks for reporting this issue.
--Brendan