9 times out of 10 only one side is full.
I did one the other week, they asked for them to be emptied. so i looked round, and said £40. Turns out there was only about 5 meters of guttering that was full... They asked for them to be emptied, so i assumed they were full?
I did one today, just a bungalow, but quite high for a bungalow [needed to use a 3m ladder extended a little bit] charged £30, 2 side about 10 meter run each. One side filled the bucket, the other side was practically empty.