US Citizen questions?

[Jun aka Pekto]

My dad arrived in May and he's planning to go back home to US on Jan.
Do someone knows kung ilang months lang dapat mag-stay dito sa Pinas
ang US Citizen na walang fee na babayaran? And if he's indeed overstayed,
how much kaya ang kailangan upon departure niya? Before kasi maximum of
3 months lang bumabalik na siya doon.

TIA

You must mean a Philippine visa fee. Last time I remember, it was less than 30 days. But, that was almost a decade ago. My daughter has her US citizenship by birth and my wife's via naturalization. They stayed 3 weeks in the Philippines (last year) and didn't have to pay any fees. Maybe someone else here might have a better answer.