Given the short notice of the question, it has not been possible to calculate the precise averages requested.
The Commissioner is obliged to determine every revision request within six months or as soon as possible thereafter. The Valuation Office endeavours to deal with revision requests as soon as possible.
In practice, the time taken to process a revision request will vary depending on the nature and complexity of the request and the time of year in which it has been received in the Valuation Office.
Decisions by the Valuation Office on revision requests are issued quarterly i.e. in February, May, August and November. Irrespective of which quarterly issue date any revised valuation is issued on, that revised valuation does not become effective for rates purposes until 1 January of the following year. Revision requests received before 10 June are processed by the November issue date (i.e. such revision requests are generally processed within six months). For practical and operational reasons, revision requests made later in the year may take somewhat longer than six months to process. However, since a revised valuation would not be effective until 1 January after that same revised valuation has been issued, the ratepayer's liability would not be affected even if the processing of a revision request had taken somewhat longer than six months (i.e. the practical effect of a revised valuation issued in February after a six month wait is the same as the practical effect of a revised valuation issued in May after a nine month wait).