@desert_dandy you you aren’t looking at the exported data, but at something Excel messed up badly for you. See this article for more details Importing PractiScore Log CSV export file to Google Sheets and Excel 365
Anyhow, I’m curious why you need to look at the exported data in Excel? The export is mainly for the purpose of a backup of your data, so you can import it back into the app. For the most part it dumps the data as it been loaded from the timer. And the app make all the data look nice for you.
In any case, the times are in 1/100 of a second