How long does it take for hyperpigmentation to go away on the body and face while using a cleanse that evens skin tone? (photos)

I went to the beach for around 4 hours+ with my family. Exactly what I didn’t wanted, I got. My skin that was exposed turned really dark (hyperpigmentation?). I used spf 50 twice or even three times to prevent this from happening because this has happened before. I’m wondering how long it will take for my skin tone to evolve back to its’ regular natural color. (I went to the beach 2 days ago). Everyday when I shower I’m using Aveeno brightening cleanser which supposedly helps even skintone.Help!