Oil light stays on too long on a cold start

I was curious, nothing to do about problem, but my 72 Duster 6 had the filter upside down so changing oil was a mess. On every car, when I changed oil, I filled up filter before I installed it. Even on horizontal filters I'd fill it up till filter was saturated and then when 1/2 full installed it. If your filter is upside down this step is almost impossible.