Timing a sailing day from the New Forest
Cruise lines give you a boarding window rather than a single check-in time, and on a turnaround day they mean it. Arriving two hours early does not get you on board two hours early — it gets you held outside a terminal that is still disembarking the previous sailing. We time the pickup to land you inside your window, not before it.
From Brockenhurst the run is short enough that this is easy to get right. The variable is not the road, it is the docks themselves: on a busy Saturday with three ships turning around, the approach to Gate 4 or Gate 8 queues. We build that in rather than discovering it with your bags in the boot.