This^^^
In a perfect world I'd have hours upon hours to play league. But the world isn't perfect. And shit goes down that is out of our control and most certainly out of yours'.
Family issues (injury, verbal/physical confrontation, something sudden like childbirth (likely someone else's), finding out family was in car accident or on a happier note someone recieves a prestigious award(like from uni)). Perhaps mum needs you to cook dinner or clean the house for guests.
Personal: sport team might need an urgent fill in, uni sends you new content to go over, work calls you in due to a co worker canceling or perhaps you were dumb enough to forget about your shift until 10 minutes before you need to be there
Internet issues (isp does unscheduled maintenance) or goes down due to bad weather or technical issues. Denial of service attack (ddos)
Hardware/system failure. Such as repetitive bugsplats, a sudden gpu driver update that starts without you knowing (makes ur screen turn on and off during installation) or another system update that force-restarts your pc. Some happen just cos they can even if you've taken measures to prevent them (such as hot fix updates).
You can't stop any of that. And anything family/real world based trumps this game every day of the week until the sun expands and kills everyone on earth.
Work, education, family, sport to a degree all trumps a video game, if you disagree please consult a therapist as you sooo gotta set your priorities straight