Back in the days when we played 40K, I had a marine army of well over 100 figures, plus as least as many, if not more, orks. On top of that, I had quite a few Tyranids, since a lot of the figures we used with Space Hulk and its excellent campaign book. The collection also contained not a few vehicles.
My buddy who I played with had a fair collection of marines, plus a decent size chaos marine force and again, a lot of Tyranids.
We designed our own campaign system which kept us going for almost a year and we tried to play at least once a week. We were lucky because at that time, my buddy had a gaming room where we could leave everything set-up without it being disturbed by cats/ wives/kids.
Happy days indeed :-)
“O Lord God, let me not be disgraced in my old days.”
'We few, we happy few, we band of brothers'