I might leave meat in a marinade for 8, 12, even 24 hours, but with fish I usually only marinate for 1/2 to 1 hour, especially if the marinade contains an acid such as citrus juice like mojo generally does. Otherwise, the acid starts to "cook" the fish in the way ceviche is "cooked".

Marinate fish in mojo sauce for 12-24 hours. Then grill or broil as usual. Works best on steakier fish like ahi tuna or swordfish.

I'd like to help but I have no c lue what "mojo" is as it relates to food.

Elaborate! I'm guessing that we don't know what you are asking. I cook pork tenderloin after marinating it in mojo - might this be your question? Everyone here is very helpful but it helps to be specific with your question. Ask away!