This script will display the bounds of a selection rectangle that is drawn on a time slice layer.
Put this script in the folder On_Map_Time_Slice_Layer_Rectangular_Selection in your Python scripts directory.
Go to Tools->Options->Environment->Python Scripts and click "Refresh from Disk". Your script should be listed automatically.
Now, whenever a rectangular selection occurs on a selection rectangle the bounds will be displayed in the Python terminal.
This simple script allows you to easily see what area you are selecting for time slice layers.