The time frame which data is viewed over restricts the resolution which the data can be shown in. If consumption is viewed over a months period, it is not possible to display data at an hourly resolution, for the logistical reason of it not fitting within the graph. For example, the maximum period that you are able to view data at an hourly consumption is 15 days, whilst to view data a half hourly resolution, the maximum time frame is 7 days. The time frame in which the data is viewed can be selected in the 'options' tab, located just under 'chart type'.