@LB The space issue I mention is space on the display and not storage -> since PanelDue is a touch screen, each button and action needs enough space to ensure you don't touch the wrong button. It also feature only a 800x480 pixel display (5i and 7i versions).
With the current layout PanelDue only have space to display 3 estimations
A print job that was simulated, have its estimated time saved to the gcode file itself specifically to prevent having to simulate them again.