For ponkotsu you had to play everyday without wasting much stamina to get into top 100k. Like 10-15 songs daily, depending on difficulty.
Kaede is a Goddess, so she is much more popular than some rabbit, so the fight for her might be more intense. And i'm pretty sure many were saving jewels for this moment. But i doubt Kaede's awesomeness will affect rankings below top50k, so 100k will be roughly the same as for Ponkotsu (less than 25k points).
Everyone (except those crazy top5 guys) get points at the same pace every day so in a couple of days it'll be easy to calculate how much you need for each place.
Well, it's a one-time chance to get this beautiful Kaede card, so i'll aim for top50k to get two of them.
Btw,
here (jp wiki) you can see cut-off scores for this event. They are updated daily.
EDIT: and
here (jp wiki) is Atashi Ponkotsu Android data for comparison.