Months of remaining inventory are increasing for luxury homes due to inventory increasing faster than the number of sales, especially for properties priced at $2 million and higher, according to Coldwell Banker Pacific Properties. Based on the current rate of sales, it will take more than a year to sell active listings in the $2.5 million-$4 million range; it will take more than two years to sell homes in the $4 million-$6 million range; and listings in the $6 million-plus range will take more than…