This tour alone lasts a full hour, and at least equal time is necessary to appreciate the other collections and the multi-media learning center on the second floor.
There are far too many beautiful things to appreciate within 15 minutes. 
mnli hypothesis: There are far too many beautiful things to appreciate within 15 minutes.  premise: This tour alone lasts a full hour, and at least equal time is necessary to appreciate the other collections and the multi-media learning center on the second floor.