Is it safe to dye my hair in two months if??

Okay so, here's the thing. I got blonde highlights in my dark brown hair, I hated it so I went back to dark brown…so yeah of course my life being my life it went black. Fantastic. Anyhow I'm really light skinned. I just want to be a brunette my natural brunette. Anyhow I'm going to spend the next two months conditioning my hair and taking care of it. In two months can I use Loreal for Dark hair only on my hair to go to a obvious brunette?

Mya, I just ask cause I have long hair and I don't want to damage it so the question is can I dye my hair in two months?

( Sorry for miss-spells.)