slipping formula
The slipping formula, as it stands, will be very hard to retain as it applies regardless of the fatigue factor of the previous sectors.
If we are to keep it in any form, it has to be modified so that the long slip is positioned when it is needed most, eg. after a night sector with a long TOD.
As it stands now, it doesn't even benefit us in some cases, as it is often placed after an easy day sector, when the following sector is the arduous one.
Also the minimum length of it being 46hrs is probably difficult to justify.