I tend to pour half of the marinade mixture in the container before arranging the meat in it. Then I pour the leftover marinade to cover the meat. Store in a cool place or the refrigerator. Marinate meat /fish slices for at least two hours. Meats can be left to marinade longer like half a day. Turn the meat at least once so that marinade can saturate both sides.
For grilling or roasting , one can use the drained marinade for basting the meat. Discard leftover marinade that is not to be used for basting