You know weeks in advance you are probably going to go into discretion on these runs
Only after months does the company get a slap on the wrist because time and again we go into discretion.
So why do crew keep going into discretion?!! I just can't get my head around this! If you allow this practice to continue, it WILL continue! If you start parking jets down route it will quickly become a very expensive party for the company.
Only do discretion when there are really, on the day, "unforeseen circumstances".
Interesting, although 5 year old, article here
Prevalence of fatigue among commercial pilots
From the same article:
Pilots who reported regularly flying into their ‘discretion’ hours had lower physical and psychological health, and overall fatigue scores, and poorer self-rated general health.