I don't even know what's the point of such sentences. Is it for PR purposes? "Look at us, we gave Osama Bin Laden 1,200 years in prison! Aren't we tough?!" Because it makes no sense to me. Just like it makes no sense to get a few years for rape or murder but be even charged with 30+ years for some online crimes.
>I don't even know what's the point of such sentences. Is it for PR purposes?
It is not for PR purposes, usually.
It is so that if a person is acquitted of one of the crimes they still stay in jail for the others. If someone gets 50 years for rape and murder and is later acquitted for murder, but not rape, they still serve their rape sentence.
The judge can decide if the jail time is served concurrently or consecutively.
It seems silly to give someone 3 life sentences, after all, you only have one life. But that means they'd have to be acquitted of 3 different crimes to get out of jail. The other reason is if those life sentences come with the possibility of parole after x years - by stacking those life sentences consecutively it would delay the parole hearings until after the person is dead.
Buy sometimes it is used to emphasize the crime's severity. Such is probably the case with the 40,000 year sentence for the Spanish terrorists. Even though they will only serve 40 years - the max allowed by Spanish law.
Denmark had a guy who killed 4 policemen. They let him out 33 years later on a pardon; by then he was 71 and had server about 33 years.
There aren't very many of these sentences, I think you can find the complete list here in the Danish article on Wikipedia:
https://da.wikipedia.org/wiki/Livsvarigt_f%C3%A6ngsel
About 50 since 1971.
Is that actually the law or some kind of convention?
Wikipedia says otherwise:
In Denmark, a life sentence (Livsvarigt fængsel in Danish) theoretically means life without parole: that prisoners will spend the rest of their lives in prison. However, prisoners are entitled to a pardoning hearing after 12 years.... Prisoners sentenced to life imprisonment serve an average of 16 years, more for cases considered to be particularly grave.
https://en.wikipedia.org/wiki/Life_imprisonment_in_Denmark