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ParticleSystem.MainModule.duration

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public float duration;

Description

The duration of the Particle System in seconds.

This property can only be set when the Particle System is not playing.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { private ParticleSystem ps;

void Start() { ps = GetComponent<ParticleSystem>(); ps.Stop(); // Cannot set duration whilst Particle System is playing

var main = ps.main; main.duration = 10.0f;

ps.Play(); } }