fleece covers?

how many times would you use yours between between washes?
DS has just decided on top of his horrible flu that he needs the runs as well :( We've found the best nappies for diarrhea are flats with Maz covers, but I only have one Maz cover :( (2 if you include the one I promised someone else...but I refuse to use that one!)
I have other covers, but none cover a flat properly & other nappies just won't work.
I've always known you can reuse a cover if you air between changes, but have never actually done it! Someone help? Oh & if anyone has any Maz covers laying around they aren't using...email them too me ;) lol
Spose I best go find all my flats & make sure they are clean & dry...

I only wash my covers every 3-4 days, maybe longer if I haven't got a load of nappies/baby clothes to put in the washing machine. I use terry flats though, so don't know if that makes a difference. I have 2 PUL covers I use during the day and just alternate each nappy change, and one wool cover that I use overnight. It gets washed more often than the PUL, especially if she's been quite wet overnight.