Have you not tried `delay_warning_time_minutes = 15` as the quoted
documentation specifies?

>        delay_warning_time_suffix
>               Expands into the  value  of  the
>               delay_warning_time parameter, expressed  in the
>               time unit specified by suffix, which is one of
>               seconds, minutes, hours, days, or weeks.

It means that the following are all valid parameters:

- delay_warning_time_seconds
- delay_warning_time_minutes
- delay_warning_time_hours
- delay_warning_time_days
- delay_warning_time_weeks


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