Honest answers please. I realise it depends on how often you go away but roughly, how many nights would you sleep in it before washing it.
We got new ones at Easter and slept 5 nights, weve since been away for a further 4 nights and are going for 8 nights next week. I still havent washed them. We are in a tourer caravan (not that it makes any difference).
My mum made us some liners but they were a pain really as the dc kept getting tangled in them so we didnt use them.