Final answer:
The question seems to refer to handling periods of less than 10 days in a performance reporting context, where normalizing data or contacting the relevant authority for guidance could be suitable approaches.
Step-by-step explanation:
In addressing the question regarding what should be done for periods fewer than 10 days, the appropriate action is not explicitly clear without further context.
However, if we take the hint provided, assuming it refers to a business or operational scenario such as electricity usage or performance reporting, then the advice would be to either treat the period as if it is only operating for 12 hours or as operating at half-power for a full 24-hour day to yield equivalent results.
Both methods are means of normalizing or standardizing a period for comparison or reporting purposes. Without specific reference to a 'performance information memorandum (PIM)' as mentioned in the question, one could infer that such a document is used for reporting performance over a standardized period, which may not be applicable for shorter timeframes.
Therefore, it would be practical to either normalize the data for comparison with standard periods or contact the relevant authority for guidance on how to best report or account for these shorter periods.