Hi There,
The billing period is determined by the meter reading cycle used by the Distributor in your area. The period is kept as close to 91 days as possible, though sometimes will vary by a few days.
From time to time, the Distributor may need to change the reading date or cycle due to a range of reasons, such as emergency work, increases in the number of properties in a particular area, public holidays or other unforseen circumstances.
A range such as 77 and 110 days is definitely more ...