Time limit for block assessment: exclusions and procedural extensions apply where searches or transfer pricing references occur. The time limit for issuance of orders under section 158BC for block assessments following search or requisition is a statutory period measured from the end of the relevant period of execution; it is extendable where the assessee obtains additional time to file returns or where a transfer pricing reference under section 92CA(1) is made. Specific intervals are excluded from the limitation computation, including the period between seizure and handing over of seized items, stay periods, exchange of information, audits, valuation references, and advance ruling processes; prescribed minimum remaining periods and month end extensions apply where exclusions reduce the available time.