Science

I guess personally I wouldn't think of it in such concrete terms. It would be more like a rolling memory of what I viewed last. I.e. 'ah I've just watched episodes 1, 2 and 3, and now I'll watch episode 1 again'. The last two episodes will naturally be clearer in my recent memory, so in effect I'm watching them in the predetermined chunks.

But maybe that scenario would break down once you get onto the third viewing of episode 1 and your memories of when you viewed what become muddled xD