How to find that particular View Section of ListView is Visible from 3 seconds

Question

i have 24 items in the listview where
firstVisibleItem = 0
visibleItemCount = 6
totalItemCount = 24

so after it by scrolling i got
firstVisibleItem = 16
visibleItemCount = 6
totalItemCount = 24

after leaving that view whose firstVisibleItem = 16 for some time , can we find that , my ListView section whose firstVisibleItem = 16 is visible from 3 seconds ( or any isntance of time ) .

Edited :

Basically , i want to create a listview where 24 images are present and i dont want to download whole 24 images , i just want to download those images which are present in that view which is present from 2-3 seconds .