I play in Britain and I would guess the time is nearer 4 hours for a fourball. Most club play here [other than club competitions] is matchplay where you can be given a short putt or pick up if your partner has the hole or you are both out of it. There are times of the week where longer rounds prevail and many clubs, .like everywhere , are very busy on Sunday mornings where heavy traffic puts the times up.
Although we generally do not use carts here anywhere near as much as in the US, most people walk and yet it doesn't seem to take that long. Competitions , strokeplay or stableford which is very popular are often in three balls because it gets them around quicker.
I only play vacation golf in the US and enjoy it but I cannot get my American partners to play matchplay, they card every round. I find it easier to add up my scores in the clubhouse after a few beers, it works wonders for my confidence!