Getting to the cabin is uncomfortable but has to be done daily unless you are operating by remote control, my last tower crane was a 50 meter climb however there are much much higher cranes than that, its not uncommon for tower cranes in the city to be in excess of 100 meters high. Some crews take one break, others take two. If your taking two breaks and coming down each time on a 50 meter tower crane you are climbing up and down 300 meters a day, 600m on a 100m tower crane.
Communication from the cabin to the dogmen, riggers and foreman is by radio, on mobile cranes they still use whistles but on a tower crane there is not much chance of hearing whistle signals from that distance.
There is no bathroom in the cabin so make sure you go before making the climb, on of the best things about the crane cabin is the incredible 360 degree view.