My Weekly Reviews now take about 30-60 min.
I used to make the mistake of actually processing and DOING stuff during my reviews in the past, but now I am very mindful of not doing that.
It works -- each week I know exactly what I am NOT doing and don't fret about it. In the last couple of years I am also finding I don't juggle thoughts like ''Maybe I shold...'' because I resolve all these thoughts each weekly during my Review. One of best productivity practices I have ever picked up.