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# predicateForWorkouts(with:duration:)

Returns a predicate for matching workouts based on their duration.

```
class func predicateForWorkouts(with operatorType: NSComparisonPredicate.Operator, duration: TimeInterval) -> NSPredicate
```

## Parameters

`operatorType`

The operator type to use when comparing the duration.

`duration`

The target duration.

## Return Value

A predicate for matching workouts based on their duration. This predicate works only on workouts.

## Discussion

Use this convenience method to create a predicate that matches against a workout’s duration. The following sample uses both the convenience method and a predicate format string to create equivalent predicates.

```swift
// Predicate matching workouts equal to or longer than 30 minutes
let workout = HKQuery.predicateForWorkoutsWithOperatorType(
    .GreaterThanOrEqualToPredicateOperatorType,
    duration: 60.0 * 30.0)
 
 
let explicitWorkout = NSPredicate(format: "%K >= %d",
                                  HKPredicateKeyPathWorkoutDuration, 60 * 30)
```

## See Also

[`HKPredicateKeyPathWorkoutDuration`](/documentation/HealthKit/HKPredicateKeyPathWorkoutDuration)

The key path for accessing the workout’s duration.

[`duration`](/documentation/HealthKit/HKWorkout/duration)

The workout’s duration.


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