Enumerator log using audit.csv

1. What is the problem? Be very detailed.
I want check enumerator's log at field and each and every scroll and time that every question will take I have an audit.csv file for specific forms it has 2 columns start and end which include some numbers I don't know exactly what is the number:
is it second/ micro second or something else ?
and I have added one column time spend for each question filled with question mark ?
can anyone help me in this issue

2. What app or server are you using and on what device and operating system? Include version numbers.

ODK Collect v1.28 and Aggregate Server v1.2
3. What you have you tried to fix the problem?

**4. What steps can we take to report
wonderful community you have helped me a lot in previous issues
I want your attention specifically please

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.
attachment
single_audit.csv.xlsx (15.4 KB)

See Logging enumerator behavior — ODK Docs for an explanation of the log structure.