chip-gameV3/Assets/Scripts/HoldTimer.cs

using UnityEngine;

public class HoldTimer
{
    private float targetTime;
    private float currentTime;

    public HoldTimer(float target) => targetTime = target;

    public bool Update(bool isHolding)
    {
        currentTime = isHolding
            ? Mathf.Min(currentTime + Time.deltaTime, targetTime)
            : 0;

        var result = currentTime >= targetTime;
        if (result == true) Reset();
        return result;
    }

    public void Reset() => currentTime = 0;
}