Judy confessed that she didn't know what a 'fortnight' is. Sorry for using non-international English!!
A fortnight is actually fourteen nights. Two weeks. Yup. It's true. Don't know why Brits and Aussies feel the need to describe half a month that way, but we do.
Fortnight is a contraction of the Old English feowertyneniht, literally fourteen nights. It dates to c. 1000. (www.wordorigins.org)
So now you know!