---
title: transferDuration
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avplayeritemaccesslogevent/transferduration
---

# transferDuration

The accumulated duration, in seconds, of active network transfer of bytes.

## Declaration

```swift
var transferDuration: TimeInterval { get }
```

## Discussion

Discussion The value of the property is negative if unknown. Corresponds to “c-transfer-duration”. This property is not compatible with key-value observing.

## See Also

### Getting server-related log events

- [uri](avfoundation/avplayeritemaccesslogevent/uri.md)
- [serverAddress](avfoundation/avplayeritemaccesslogevent/serveraddress.md)
- [numberOfServerAddressChanges](avfoundation/avplayeritemaccesslogevent/numberofserveraddresschanges.md)
- [mediaRequestsWWAN](avfoundation/avplayeritemaccesslogevent/mediarequestswwan.md)
- [numberOfBytesTransferred](avfoundation/avplayeritemaccesslogevent/numberofbytestransferred.md)
- [numberOfMediaRequests](avfoundation/avplayeritemaccesslogevent/numberofmediarequests.md)