How long can the average mind think about one thing — one thing only, without slipping first into thinking about thinking about that thing and taking off from there on a senseless chain of irrelevancies? About three and a half seconds we are fucked

My name is Hannah. I like shoes and booze and watch a lot of stupid tv. I spend most of my time with a fat cat.
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How long can the average mind think about one thing — one thing only, without slipping first into thinking about thinking about that thing and taking off from there on a senseless chain of irrelevancies? About three and a half seconds we are fucked