What length of indoor range

[I. J.]

needs girth too
10 people shooting 30 yards is probably better than 2 people shooting 60 yards

Quite so.
In light of this, what girth do you prefer for your indoor shooting ranges?

(ooh, beat me to it Dan)

Its also about the 'quality' of members. I regularly pass a 50m plus firearms approved range to go to my far more friendly own airgun specific club (40m) with 7 firing points or Rochdale A.G.C. (50m) the later having approx 20 firing points. Its all about the fun you have while you are there. No equipment snobbery - just a damned good laugh.