def METHOD_NAME(self) -> float:
    account_summary_data_update = getattr(
        self, "_account_summary_data_update", None
    )
    if account_summary_data_update is None:
        # force an update
        return STALE_SECONDS_ALLOWED_ACCOUNT_SUMMARY * 9999
    elapsed_seconds = (
        datetime.datetime.now() - account_summary_data_update
    ).total_seconds()
    return elapsed_seconds