For a full long distance train pausing between two multi-hour trips it's reasonable.
5 Minutes for disembarking, 10 minutes cleaning, 10 minutes for boarding and you have 25 minutes platform occupancy. But on top of that the tracks will be blocked by the train going in and out for a few extra minutes, you need to find a slot on the line itself, and you need to allow for disruption.
It's all very inefficient in terms of occupying scarce and inelastic inner-city track capacity, so modern practice is to build through stations if at all possible and send trains off to sidings to be cleaned, but that wasn't practical 100 years ago.
5 Minutes for disembarking, 10 minutes cleaning, 10 minutes for boarding and you have 25 minutes platform occupancy. But on top of that the tracks will be blocked by the train going in and out for a few extra minutes, you need to find a slot on the line itself, and you need to allow for disruption.
It's all very inefficient in terms of occupying scarce and inelastic inner-city track capacity, so modern practice is to build through stations if at all possible and send trains off to sidings to be cleaned, but that wasn't practical 100 years ago.