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

<time_interval>

<digit-not_zero-pl> <time_interval_unit-hour-pl> and <minute_duration-pl> <time_interval_unit-minute-pl>

<digit-not_zero-pl> <time_interval_unit-hour-pl> and <minute_duration-sing> <time_interval_unit-minute-sing>

<digit-not_zero-sing> <time_interval_unit-hour-sing> and <minute_duration-pl> <time_interval_unit-minute-pl>

<digit-not_zero-sing> <time_interval_unit-hour-sing> and <minute_duration-sing> <time_interval_unit-minute-sing>

<tens_number-not_digit_sequence-pl> <time_interval_unit-pl>

<tens_number-not_digit_sequence-sing> <time_interval_unit-sing>