AWS Signed URL not surviving for more than an hour

Client initialisation in Go:

type AWSClient struct {
    uploader   *manager.Uploader
    downloader *manager.Downloader
    psClient   *s3.PresignClient
    s3Client   *s3.Client
    sesClient  *sesv2.Client
}

func NewAWSClient() AWSClient {
    log.Println("Configuring AWS ...")

    cfg, err := config.LoadDefaultConfig(context.TODO())
    if err != nil {
        log.Fatal(err)
        panic("Error configuring AWS.")
    }

    s3Client := s3.NewFromConfig(cfg)
    sesClient := sesv2.NewFromConfig(cfg)

    return AWSClient{
        s3Client:   s3Client,
        uploader:   manager.NewUploader(s3Client),
        downloader: manager.NewDownloader(s3Client),
        psClient:   s3.NewPresignClient(s3Client),
        sesClient:  sesClient,
    }
}

And get signed URL using:

func (c AWSClient) GetPresignedURL(ctx context.Context, awsBucket string, key string, ttl time.Duration) (string, entity.Error) {
    logger := rctx.LoggerWithFn(ctx)

    input := &s3.GetObjectInput{
        Key:    &key,
        Bucket: &awsBucket,
    }

    resp, err := c.psClient.PresignGetObject(context.TODO(), input, s3.WithPresignExpires(ttl)) // 6 days expiry.
    if err != nil {
        logger.Log(p.Error, "error retrieving pre-signed object: "+err.Error())
        return "", entity.InternalError(err)
    }

    return resp.URL, nil
}

Even if I'm setting 6 days expiry, still the URL is expiring in 1 hour. Can anyone share some pointers to debug this scenario?