How can I set the Display Size amount for my Iceberg order in Classic TWS?

You can see how many days are left until the last trading day for an option by adding the "Days to Last Trading Day" column to your TWS or Mosaic page. To add a column to your TWS page, right click on the tab/page header and select Layout. Click the Market Data Columns tab and expand the Contract Description section on the right side. Select "Days to Last Trading Day", click the Add button in the middle, and you should now see those columns on the left side under Shown Columns. Once finished, click the Apply and OK buttons at the bottom of the window…

An order that uses the good after time/date field is held in the IBKR system and submitted to the market on the date and time you specify.

Classic TWS…

To place a GTD order, first add the Exp. Date and Exp. Time columns to your TWS page. Right click on the tab/page header and select Layout. Here you will find all columns that are available to add to your TWS page. Click the Order Columns tab and find the Time in Force section. Click Exp. Date and Exp. Time followed by the Add button in the middle. You should now see those columns on the left side under Shown Columns. Once finished, click the Apply and OK buttons at the bottom of the window…

To create or edit a Hidden order in Classic TWS you first need to add the Hidden column to your trading page. To add the Hidden column, right-click on a column header and click "Insert Column." In the Order Attributes section of the menu select "Hidden."…