For me it's just, put my favorite girl in the last seat and keep her deco's raised. Even if you do long runs it's not going to help much to have girls in other seats, from what I can tell at least. The only time it might be helpful is at lower levels, even then at most all you'll need is 3 girls for seats 3, 10 and 11. Takes less than 5 mins to hit 5k levels now while just focusing on seat 11 girl. Only times I go over 5 mins are when using up all my speed ups or being unable to get on for a while.~5 mins = 360k ish shares, ~15 mins = 640k ish shares (at my level with my deco's) so quick runs for me are way more important.