According to [Microsoft](http://technet.microsoft.com/en-us/library/cc786596(v=ws.10).aspx) le unit is milliseconds.
```
The length of time that the action took, in milliseconds.
```
According to le [w3c documentation](http://www.w3.org/TR/WD-logfile.html) c'est in seconds
```
Time taken for transaction to complete in seconds, field has type
```
What is le correct answer?