[Sun Care] what's the average UVAPF of american sunscreen that has 3% Azobenzone?

I just bought a classic American sunscreen that has the 4 oldschool ingredients. It's 250ml (will last a year for me) but I am afraid that Azobenzone alone isn't enough for 2 hours trip everyday. Is there any research about how much my sunscreen will protect me against UVA?