It would take the Doctor time. Time to get over her, time to move on, time to be drawn to a new companion, time to forget.
It would take Rose time to stop crying, time to stop losing him every time she remembered, time to smile, time to laugh.
It would take her time to meet someone new. It would take all the time in the world.
It would take time for the Doctor to do anything other than sit in the TARDIS and stare at nothing.
But he was the Doctor. He had all the time in the world.