As this event gets bigger its all about the enviromental impact that we cause longer distance less laps less damage the distance is irrelevant. We want to be invited back .
Fair point. 300 bikes making one pass will do less damage than 150 bikes making two passes, will do less damage than 100 bikes making three passes.
I guess the problem I see is that when you run multiple laps, riders get to choose how much riding they do. A typical vinduro loop of 10~15km gives riders a lot of flexibility to choose how much riding they do - one lap or twenty or anything in between. Obviously Harrow needs longer loops - the question is how much longer.
As the loop gets longer, that flexibility disappears. The casual riders are presented with a bigger challenger than they may be comfortable with (90km or nothing), while the more serious riders may also be limited (90km may not be enough, but 180km might be too much or impossible).
No idea if the new area lends itself to a cloverleaf pattern, but maybe that would a good solution? Maybe one leaf of the clover could be an optional "hard" loop, which would distract/slow down the more gung-ho riders?