ANSWER:

The above statements refer to two, different types of X-waves. One where the X-wave is larger in price than the prior A-B-C Flat (or Triangle). The second where the X-wave is 61.8% or less in price of the prior A-B-C. 

In the first instance, where wave-X is larger in price, it can (and frequently is) more time consuming than the total time of the prior A-B-C. In this second instance, when wave-X is 61.8% or LESS in price of the prior A-B-C, it must also be LESS time-consuming than the prior A-B-C (or at least not more time-consuming).