If you're using Google Sheets, DESPITE the yellow box at the top of all pages on this site, it'd be FAR BETTER to provide a link to a shared copy of the Google Sheets file rather than an .XLSX simulacrum which the rest of us would need to download from this site, then upload to Google Sheets. Yes, the yellow box above needs to be updated for the CURRENT millenium.
See this.
No formula in H2. In H3, try
This does no error checking. If you have 2 or more logouts for a given person before a login for that person, the duration will be calculated as the time between the latest logout and the login.
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