Shrinking inventory and shorter marketing times were key characteristics of the North Fork housing market in the second quarter. Listing inventory for the region declined 20.5% to 434 from the year ago quarter. A similar pattern was seen in the luxury market, which represents the top 10% of all sales. Luxury listing inventory fell 9.9% to 82 over the same period. Days on market, the average number of days from the last price change to the contract date, was 122 days, 35 days faster than during the year-ago quarter…