Imagine collaborating on a musical project 150 years ago, a symphony perhaps, communicating between London and Berlin. This is a fairly sizeable distance by bullet train standards, let alone the most reliable form of long distance communication we have in our little daydream, courier on horseback. So, after six months of sending letters to simply work out how it would all work and the style of the project it would be, undeterred by the difficulties you decide to give it a go. I reckon about six years later would mark the point where you got so bored that you gave up. Or secretly finished it yourself, washed your hands of further annoyance and trained the dog to attack the postman. Maybe it would have been fantastic, maybe.