I use a mixture of disposables and cloth as am changing over to cloth but don't have enough yet. On a disposable day when he poos at the right time 3 nappies can last 24 hours! I don't think that's actually very good for him - can see the crystals on his bum. Bad mummy. On Cloth days he seems to get through about 5 or 6 in 24 hours.
My 20 mo goes through anywhere between 5 and 8 depending on her mood lol.
A dispo can last 12 hours plus and can hold a lot more wee than a washable nappy but would you like any baby to sit in there own outpourings for that long really no matter how well it is soaked up? I know I wouldn't. Much prefer cloth even if it does feel wetter quicker, at least I know what's next to babies skin.
At 15 mo we usually use between 4 and 6 per day (reusables but dont change her any different if in disposables). Usually 2 in morning, 2 in afternoon and 1 at night, any more due to extra poos or power wees. No idea how many wees she does a day but change her straight after every poo (usually 1 or 2 a day)
I dont like my ds to wear a nappy for more than about 4 hours at a time during the day so we use about 3 or 4. He is pooing a bit more at the moment so that adds a couple more onto it. He wears a nappy overnight from around 6.45pm to 8am.