rxinhed nailed the price. You can buy rebuild kits very cheaply too, but if there's pitting in the master or slave then its a waste. As far as how long it takes, I'd say an afternoon. And, make sure you have a 10mm flare nut wrench for getting the line apart. It'll really help when trying to get the flexible hose off the hard line. I almost rounded mine with a standard wrench before I borrowed a flare wrench from a neighbor. I'm talking about one of these:

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