The merlot was already pressed? I've never bought red wine juice, just grapes, so I didn't know it came already pressed. I have bought white grape juice before.
I usually keep wines in primary 5-7 days before racking to secondary and topping up and airlocking. I don't airlock my primary, unless there are fruitflies around, as it makes it a pain to remove the lids and stir down the cap twice per day, so I just cover with a towel for primary to make that job a bit easier.