So I just noticed my Dungeon Deserter debuff I took to leave an absolute mess, I knew would take longer than I had time for. I leave and log out. I get back two hours later and this toon still has that 30min Deserter debuff, now counting down as I write this.
So not only can trolls kick you to give you this abomination of a debuff, and lfr keeps putting you in half raids where you have already killed all the last bosses, just need the ones already dead. But now it also lasts through log out. GOOD JOB with this new “feature”! 
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I think the dungeon deserter debuff is a bit outdated at this point. Heroic dungeons don’t lock you out anymore and it’s causing more headache than good for a lot of players. Nobody cares about LFR, everyone drops in and out of that without any care in the world, but dungeons shouldn’t get you a deserter debuff.
You should submit a bug report. It should tick down while you’re offline. The support article confirms it: https://us.battle.net/support/en/article/11159
Removing deserter will mean you half to contend with the people who believe they deserve your first born for leaving their party.