As I understand you want to create hourly chart but only with 1 month of data visible in the chart window. You can control the number of bars visible inside the chart by zooming (hit ctrl+/- for shortcut) and set the zoom level at your choice, may be till approximately 1 month of data is shown inside the visible area of chart. Now, you can create a chart-template and use that as default template for all your charts. This way all your new charts will same zoom level.
Please let me know if you need any clarification or help.