so I have a question. If someone were to send 1.01 BTC would they be included in just the >1 btc category or would they be included in all three categories?
No!
Each category is seperate. This is because if someone has only little BTC to invest, he has still a good chance of getting many coins in category 2. But he has no chance of entering category 4.
My guess is, that in the end, the NFD per satoshi invested will be the highest in category 2 then category 3 and the worst in category 4!
But you can enter all three categories if you send to all of them

(But you can never get more than 100M, even if you send maximum in all three categories)
How long does the giveaway last?
Till the end of the IPO. This is the may 10th at 23:59 UTC
PS: Because noone wrote to an escrow yet, I did it myself and messaged Anon136!
excellent answer and great reasoning. I like where you're going with this.
Another question, how would you know which category i would want to be in if someone sent .1 btc?