from typing import List


def get_starttime_default(features: List[str]) -> int:
    """
    Heuristic for selecting a sound attribute as default for start time
    :param features: list of available features
    :return: index of the suggested feature in the list
    """
    for idx, f in enumerate(features):
        if 'start' in f.lower():
            return idx
    return 0