---
title: duration
framework: applicensedeliverysdk
role: symbol
role_heading: Instance Property
path: applicensedeliverysdk/aldlicenseattribute/duration
---

# duration

The maximum amount of time, in seconds, that iOS considers the license valid.

## Declaration

```swift
var duration: UInt64
```

## Mentioned in

Licensing alternative distribution apps Renewing and revoking app licenses

## Discussion

Discussion The alternative app marketplace determines a value for this property at its discretion. iOS doesn’t let an app launch if the duration of its license lapses. A value of 0 indicates that the license doesn’t expire. To revoke a license, see Renewing and revoking app licenses. For an example that sets this property, see Licensing alternative distribution apps.