The category "<second_setting>" can be expressed as follows:

<second_setting>

<digit-pl> <time_interval_unit-second-pl>

<digit-sing> <time_interval_unit-second-sing>

<minutes-digit_sequence-pl> <time_interval_unit-second-pl>

<minutes-digit_sequence-pl> point <digit> <digit> <time_interval_unit-second-pl>

<minutes-digit_sequence-sing> <time_interval_unit-second-sing>

<minutes-digit_sequence-sing> point <digit> <digit> <time_interval_unit-second-sing>

<minutes-not_digit_sequence-pl> <time_interval_unit-second-pl>

<minutes-not_digit_sequence-pl> point <digit> <digit> <time_interval_unit-second-pl>