Function parse_duration_from_secs_or_ms 

pub fn parse_duration_from_secs_or_ms(
    arg: &str,
) -> Result<Duration, ParseIntError>

Helper to parse a Duration from seconds if it’s a number or milliseconds if the input contains a ms suffix:

• 5ms -> 5 milliseconds
• 5 -> 5 seconds
• 5s -> 5 seconds