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Are you sure it doesn't? Have you reviewed the code? Or... are you just making stuff up?

You can see the first 5 day ICO window ("Day 0") can be found in the code right here.

'Day 0' is the first five day window. 'Day 1' is the second window, 1 day long, so that would be the sixth day. 'Day 2' is the seventh day and so on.