'How Long" in Tagalog

How much? (the price, not the quantity)

How...?  (the amount, not the quantity)

Gaano karami ang kailangan mo?
How much do you need?

How ______?

Gaano karami?
How much?
(the amount, not the price)

Gaano kalaki?
How big?

Gaano kadalas?
How often?

Gaano kalayo?
How far away?

Gaano kahaba?
How long? (an object's length)

Gaano katagal?
How long? (period of time)

Gaano katagal ka na dito?
How long have you been here?

To ask how to do something, use the word paano.