Yes, the "is 10 days" should be "if 10 days," although as I understand it, it's not about what flight(s) are earlier, it's about the airport from which the first flight departs, i.e., the point of origin/point of commencement. It may or may not also be about the type of fare. The poster was asking if a non-RTW ticket that originated in the same location would have the same reduced availability as an RTW originating there.