Yes, there is a way to chart more than 255 bits of data in Excel. One way to do this is by using a combination of multiple charts or by using a pivot chart.

Here are the steps to create a pivot chart:

1. Select the data range that you want to chart.
2. Go to the "Insert" tab and click on "PivotChart".
3. In the "Create PivotChart" dialog box, select the type of chart you want to create and click "OK".
4. In the "PivotTable Field List" pane, drag the fields that you want to use for the chart to the "Axis" and "Values" areas.
5. Customize the chart as needed.

There is no specific limit to the amount of data that can be charted using a pivot chart. However, keep in mind that the more data you have, the more complex the chart may become and it may take longer to load or update. It's also important to ensure that your computer has enough memory and processing power to handle large amounts of data.