The length of historical data for any intraday interval (i.e. chart timeframe) is 5 000 bars/candles (for Pro account holders it is doubled: 10 000 bars/candles) + additionally several bars/candles back to the beginning of the week, month or year (depending on the resolution). Unfortunately, this limit cannot be extended.
If you change the chart interval to daily or daily-based, you will see a longer date range. We display all available data for daily-based intervals.