The time periods for a CTO are the same as for detention under s3. It lasts initially for a maximum of six months, but can be renewed for a further six months and thereafter can be renewed for 12-month periods (s17C, s20A(3)).There are two mandatory conditions (s17B(3)):The first mandatory conditions relates to renewal of the CTO; the second to assessment for a SOAD certificate. As soon as possible after revocation of the CTO (s68(7)). 2  Six months after the beginning of the s3 admission, or any immediately previous s2 admission, if there has been no Tribunal application or reference (discounting any made during the s2) (s68(2)).