In November of 2015, my wife had surgery on her heel to remove a bone spur that had been there for the past 21 years or so. She was on some pain medication and I kept track of when she would need subsequent doses.
This long-form ambient track was based on a time interval and since I'm using a timer to measure when she needs to take her meds, I figured, why not put the time to another artistic use by creating a drone? She is always saying that I make my drones by putting a brick on the keys so I used the eventide space pedal and resting it on some black keys to create the main portion of the drone, I had an effect set up with one of the knobs that I turned every so often while simultaneously playing random notes along the way to help the drone evolve.
I also have a 15 hour version of this which I intend to use in creating an ambient image of being in a brain fog which she said she's been in for a couple of days since the surgery was finished. I intend to add more elements, some industrial ambience during the times when her pain medication would start wearing off. at every three hour interval, I will add an hour or 45 minutes of more heavy metallic drone to represent the gradual return and then alleviation of the pain that naturally occurs after such surgical procedures. Whether the completion or release of this extended version will ever be realized is something I don't yet have determined but it's an interesting idea to pursue at some point.