We haven't got a tumble dryer - it takes about two days for the liners and wraps to dry after they've been washed, and will do a daily nappy wash. Will only wash the wraps if they're pooey/dirty, but not if the liner has caught it all.
So how many wraps am I likely to go through in three days?
Also can you really not use fabric softener on them? How do I uncrispify them?
Use what you've got - 6 should be fine, but you may well need to get some better wraps. Popolino (Motherease) and Nature Babies are the best workhorse wraps IMO. BM's are total rubbish as far as I'm concerned! Just don't despair if they leak - get some better wraps, and you'll find they do much better!
If you are planning to breastfeed then you might find you go through a lot. But 6 sounds fine. I found we went through a wrap at every poo in the early, breastfed, pre weaned poo.
It shouldn't take 2 days for a wrap to dry though? The nappies maybe but most wraps dry within a few hours? I can't remember what the bambino mio wraps were like to dry but I would be very surprised if it takes 2 days.