def parse_duration(s: str) -> float:
    """Parse a duration string to seconds.

    Suffixes: ms (milliseconds), s (seconds), m (minutes).
    A bare number is treated as seconds.
    """
    s = s.strip()
    if s.endswith("ms"):
        return float(s[:-2]) / 1000
    if s.endswith("s"):
        return float(s[:-1])
    if s.endswith("m"):
        return float(s[:-1]) * 60
    return float(s)