Attempted murder of a head of state, maybe 25 years or so? Assuming pre-meditation. Attempted murder of myself, 10 years at most, if not pre-meditated, otherwise if it was pre-meditated then some more, but with a chance of parole given good behaviour and maybe psychiatric observation.
Aggravating or other circumstances should be taken into account too, I'm sure that those judges would do their best.
44 years is excessive, by any measure. You're simply not talking about the same person any more. 22 -> 66, that's a life gone. Does the guy in that article look like a serious threat to you? To the officer he tried to kill? To anybody else?
All I see is an old guy who made a really bad dumb move when he was a lot younger, and probably a whole angrier than today. I also question the extra months after he served the many many years for a shoplifting charge when he was 17. That's just revenge, it has nothing to do with justice or having the best of society at heart.