Im not Voj but I marinade for about 24 hours in Lawrys marinade. Then I throw it on the bbq.
You're doing a good thing, it's better to marinate them yourself, like you did.
Because store-bought marinated chicken breasts contain some that might leave you suprised. There are different variaties of marinated chicken, some of the once I've bought, among the other ingredients had malto-dextrin and soy-protein
Best bet is to buy a normal chicken breast, and spice it up the way you like it.