Thank you 
I did it like this:
- Write notes what is mentioned in Slack (the comments get timestamps)
- Open slack in web browser
- Inspect network traffic
- copy the comments as JSON from the call comments.view
- scroll up in the conversation
- then new ajax calls will be triggered
- copy those as well, (beautify with jsonlint.com)
- i pasted everything into a text file, and made all messages into one js array
- converted it to csv using an online converter
- import it into google spreadsheet as csv
- sort by timestamp
- now i have two columns i want, the one with the text and the one with the timetamp
- find the difference in timestamps
- generate a concat of the video url and the timestamp diffs for all messages
- copy pasted that into sublime and replaced some characters so it would become a valid markdown list with links