If a child is found guilty of more than one offence on the same day or in the same proceeding, the total period of 2 or more sentencing orders of the same type made in respect of the offences must not extend beyond the child's twenty-first birthday or exceed—
(a) in the case of a good behaviour order or a probation order—
(i) 12 months, if the child is under 15 years of age on the day of sentencing; or
(ii) 18 months, if the child is 15 years of age or over on the day of sentencing; and
(b) in the case of a youth supervision and support order—
(i) 12 months, if the child is under 15 years of age on the day of sentencing; or
(ii) 24 months, if the child is 15 years of age or over on the day of sentencing; and
(c) in the case of a youth control order, 12 months.