the number you put in the dialog is the multiplier value. The timeframe of the main chart gets mulitplied by it.
For example if your main chart has a timeframe of M1 (1 minute) and you enter 10 as the multiplier the chart generated will be an M10 (10 minutes) time frame chart. If your original chart is a H1 (1 hour) chart and you enter 24 as the multiplier the new chart will be a D1 (daily) time frame chart.
Please let me know if this helps.