With a 2020 pack now in hand, my run of Topps packs is at 52 years. The pack run matches my complete set run, from 1969 to the present.
I have the packs displayed on three shelves on a wall in the WW World Headquarters.
The top shelf has the packs from 1969 - 1986. On shelf two we move from 1987 to 2003. On the bottom the run is from 2004 to 2020.
There are 18 packs on each of the top two shelves. The bottom shelf has sixteen. There is no room to add any more to the top two, so in two year the third shelf will be maxed out.
I've got a GIF that shows the growth on the shelves, with pictures from 2009 and then from 2012 to 2020. You can see how I've had to squeeze in more packs per shelf to get them to fit.