We have sold a contract. How long it takes depends on all the same factors that go into buying -- contract size, points status, price, resort, market conditions, seller's needs and the like. Some contracts never make it to the listings, others take several months. Probably best to call the brokers and ask them about your situation. We have used the Timeshare Store for two purchases and our sale. Have been very happy with their guidance and performance.
My sense of the market is generally that BCV and VWL are smaller and seem to be sought after resorts so they might go faster than others. Small to mid-size contracts might go faster than large contracts. Contracts with current and/or banked pooints are more desired than stripped contracts (even with appropriate price adjustments).