Rare, if not very rare ang Extend ads, even when I was on Premium; the odds of getting Extend ads were at least, on a low time for me, at 20+ in a year (
my old 2012 stats ) to at least 50+ (
my old 2014 stats )
All ads are determined by the advertisers (
including how many they want to release, where to show those ads, how much per ad, and for how long it should stay )
Pag nag-appear sa View Ad section mo, click kaagad! Like most other ads, they won't last very long on your list, except in the case of Sticky ads -- which will stay on your list for at least 24hrs