In Bramble, 'Available Time' represents the total time spent at work, including Overtime. It does not include Planned or Unplanned Leave.
Available Time can be further broken down into 4 categories:
Time spent on Supporting Tasks
Time lost to Friction
Gap.
"Available FTE" is arrived at by taking the "Available Time" in hours and dividing it by the average number of working hours per FTE per day.