Here's one way the doctors in hospices measure their patient's likely remaining lifespan .

First they compare the his condition today with his condition last month. Then they compare his condition today with his condition last week. Finally they extrapolate forward to the end of the following month, assuming same rate of change as in last week.

Well it made sense when Dr K explained it.

(For those who want to try doing predictions, last month W was able to travel between Dublin and Edinburgh, today he can't stay awake more than three hours, or walk more than 100 yards slowly. His inability to do stairs started in the past week).

Tempus fugit guys, tempus is certainly fugiting.