Different bottles have different spray mechanisms, so there is no correct answer. The following threads will help you work out your answer.
Number of sprays per volume
Does anyone know how many sprays are in a....
How many sprays in a 0.05oz sample?
sprays per unit volume
how many full sprays can you get from a 5ml mini?
How many sprays in 1ml?
How many sprays per ml?
Number of sprays...?
How many sprays is one sample vial worth?
Eddie: Sweetie, what are you drinking?
Patsy: Oh, this? Chanel No. 5.
-- Absolutely Fabulous