Tick charts represent the count of intraday trades: a new bar (or candlestick, line section, etc.) is plotted after completion of a certain number of trades (ticks). This aggregation type can be used on intraday charts with time interval up to five days. For example, a 2d 133t bar chart plots the price action for two days, recording open, high, low, and close prices every time the number of trades becomes equal to 133. You can use any number of ticks up to 100,000 to set as the aggregation period. To learn more on how to set a time frame, including the aggregation, refer to this page.
A chart can initially load up to 40,000 bars. When the number of bars reaches 80,000, the chart is reset to the last 40,000 bars for performance reasons.