I bought 6 pairs of monthlies a year ago, and have only gone through 2 pair so far. They're good for 30 "day" uses, and as forseti-6 said, if you take good care of them, they'll go longer than that. You can feel when they need to be replaced; they'll be scratchy/itchy on your eyes, and not feel quite right. If you only wear them for a few hours each time, you can definitely stretch this. In my case, I wear them at Ultimate tournaments and stuff, so I would get 45-60 wears out of one pair. In the end, you can judge for yourself.
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