Here in the UK a life sentence means that you're still under some restrictions even after you're released from prison, so you could spend 20 years inside and then the rest of your life outside but "on licence", which means you have to abide by certain conditions otherwise you go back to prison.
shine_on t1_j6i3cn3 wrote
Reply to comment by 1029394756abc in ELI5 - Why do criminals get sentenced to Life without Parole PLUS ten years for example? by sir_cas
Here in the UK a life sentence means that you're still under some restrictions even after you're released from prison, so you could spend 20 years inside and then the rest of your life outside but "on licence", which means you have to abide by certain conditions otherwise you go back to prison.
https://www.gov.uk/types-of-prison-sentence/life-sentences
https://www.criminaljusticehub.org.uk/task/what-does-being-on-licence-mean/
Some people in the UK have been sentenced to a "whole life" sentence but it's quite rare.