How long can I marinate shrimp?
For large, shell on shrimp, I usually do 2 days. Shell off, 8-12 hours is often enough. There are variables: whether you are skewering and grilling them (they grill very quickly unshelled and dry out, although your olive oil base will help). My marinade usually includes olive oil, Worcestershire, soy, orange juice concentrate, dry mustard, garlic, coarse pepper, and fresh ginger. The water-based liquids and ingredients dissolved in them will penetrate the shrimp faster than the olive oil and its immersions.I prefer shell-on to preserve the shrimp juiciness, and I put a roll of paper towels on the table in addition to napkins. Finger-licking is part of the fun of peeling and eating shrimp, unless you are doing a quaisi-formal sit down affair.