I've been to a 6x20mins DE and we all left before the last run. 100 mins was plenty for me, I couldn't imagine 160mins. Not sure it would be productive.
I can really tell when I'm getting mentally and physically fatigued in my Tag Kart as my lap times go to shit, and so I stop. With DE's they're not generally timed (unless you do that yourself), so I could see myself going longer than I should... and an "OH SHIT!" moment occur. Just my two cents.
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Any man who can drive safely while kissing a pretty girl is simply not giving the kiss the attention it deserves. ~Albert Einstein
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