# SNTimeDurationConstraint Defines the time duration windows the request’s underlying sound classifier accepts with a range, or an array, of durations. ``` @interface SNTimeDurationConstraint : NSObject ``` ## Overview Inspect the constraint’s [`type`](/documentation/SoundAnalysis/SNTimeDurationConstraint-c.class/type) property first to determine whether to check [`durationRange`](/documentation/SoundAnalysis/SNTimeDurationConstraint-c.class/durationRange) or [`enumeratedDurations`](/documentation/SoundAnalysis/SNTimeDurationConstraint-c.class/enumeratedDurations) next. ## Topics ### Inspecting a Constraint [`type`](/documentation/SoundAnalysis/SNTimeDurationConstraint-c.class/type) An enumeration that tells you which constraint property to inspect. [`SNTimeDurationConstraintType`](/documentation/SoundAnalysis/SNTimeDurationConstraintType) Defines the types a time duration constraint uses. [`durationRange`](/documentation/SoundAnalysis/SNTimeDurationConstraint-c.class/durationRange) A time duration range the request’s underlying sound classifier accepts. [`enumeratedDurations`](/documentation/SoundAnalysis/SNTimeDurationConstraint-c.class/enumeratedDurations) An array of time durations the request’s underlying sound classifier accepts. ### Creating a Time Duration Constraint [`- initWithDurationRange:`](/documentation/SoundAnalysis/SNTimeDurationConstraint-c.class/initWithDurationRange:) Creates a constraint with a time duration range. [`- initWithEnumeratedDurations:`](/documentation/SoundAnalysis/SNTimeDurationConstraint-c.class/initWithEnumeratedDurations:) Creates a constraint with discrete time durations. ## Relationships ### Inherits From [`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)