Airtable does have a built-in Time Tracker Block, but it won’t do what you’re looking for in this scenario. That’s because it starts over at 00:00 again whenever you create a new record. Although it does pick up where it left off on older records.
So, your best solution would probably be to simply add a “Created Time Field” to your table. Every time you create a new record, each new record will get the timestamp of when you created the record. it’s quick, easy, and foolproof.
Then, later on, when you are done with all of your notes, simply create a formula field that subtracts the ACTUAL START TIME of the video from your Created Time Field. That will get you the timestamps that you’re looking for.
A rough version of this formula would look like this:
The trick is to format your formula field to result in duration, which is based on seconds.
However, we wouldn’t want you to have a date field called “Actual_Start_Time” — we would want you to hardcode the actual start time into this formula. That’s because (a) it will be the same time for all of your records, and (b) you can’t easily put seconds put into a date field.