I think we looked at 40+ over the space of 2 years or so. We were first time buyers in an area new to both of us and it took us ages to work out what we wanted in a property.
This time around (with the benefit of Rightmove etc) it is far easier to check out properties online and I think we have agreed the sort of house we are looking for. We haven't actually viewed any houses yet, but I'm hoping we don't have to look at 40 to find one we like!