http://www.interaksyon.com/article/92062/lpa-expects-to-intensify-into-td-in-the-next-48-hours
Each astrological factor has an orb of influence of either 4-5 days before "or" 4-5 days after the exact date of the astro-meteorological factor. This range is roughly the time it takes a typhoon for form, travel (from the Pacific Ocean) and to make landfall.