---
title: duration
framework: SensorKit
role: symbol
role_heading: Instance Property
platforms: [iOS 26.0+, iPadOS 26.0+, Mac Catalyst 26.0+]
path: sensorkit/srsleepsession/duration
---

# duration

## Declaration

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

## Discussion

Discussion Sleep session duration Equal to 0 if endReason is SRSleepSessionEndReasonNoEndEvent