I hardly had any bleeding at all.
I bought 2 packs, and ended up using a couple of pads - and that was it. It was less than a normal period.
The left over pads DID come in handy though, as someone gave me the great tip of putting one across your CS scar, so that clothes don't press on it. I did that for a couple of weeks, even though it wasn't sore, just because it made it feel nice and cushioned.
I think everyone is different - there's no way of knowing, unfortunately!