---
title: duration
framework: healthkit
role: symbol
role_heading: Instance Property
path: healthkit/hkworkoutzoneduration/duration
---

# duration

A property that specifies the time spent in this zone, measured in seconds.

## Declaration

```swift
let duration: TimeInterval
```

## See Also

### Accessing duration properties

- [zone](healthkit/hkworkoutzoneduration/zone.md)