BBM
Because the cricket bat was already used to hit the door twice, causing the crack that was large enough for OP to simply use his hands to rip the panel out of the door. It wouldn't take OP 2 mins to rip out the panels and drag Reeva from the toilet room.
Also, Isn't the 3:17 time based on the Stipp's clock? The first phone call was made a bit before 3:17 wasn't it? Anyway, it could be more like 3-4 minutes. And we only have Oscar's word for all the happenings before the phone call. He could have called first, and then dragged Reeva out. All we know for certain is that he was about to carry her down the stairs when the others arrived, so the time is somewhat flexible if we don't stick to Oscar's story.