Somewhere between $100~$200, so I'll just say $150.

$40 on a guaranteed Anenome
$60 on 3 guaranteed 5* tickets
$X on miscellaneous expenses, such as $1~$3 gacha rolls and some Flower Gems here and there.

One of the things that's really nice about this game is that it's really nice for all sorts of spenders, from freemiums, whales and cheapskates like myself.