The three hours is a bit misleading. A majority verdict can’t be given until at least two hours and ten minutes have passed, and most likely it will have been a bit more than that. So, it may very well be the case that everyone had entrenched positions for a couple of hours, and it was clear no-one was going to budge, so a message was given the the Judge and he gave them the majority direction, upon which they came back with a verdict. Three hours, in a high profile case like this, is pretty quick tbf.