Jess--
my heavy wetter wets through a snoozywun in 5 hours.
i find WC NN, sandmans and possum pouches KK the best will last 12 hours with a wool cover only.
I highly recommend contacting robyn at possum pouches, she is so lovely and more than willing to help you get the right nappy for your bub

eta lotus are also good but not being made atm