It’s annoying the hell (pun intended) out of me. I log in at night after work, there is no helltide or world boss. I go into a nightmare dungeon. I come out and there is 20 min left in the helltide. Either have helltides running 24/7 or put a timer on it so I know when to come out of the dungeon or not to start one.
Appreciated Blizz 
They wont do it, same with boss timers etc. They want you to suffer.
Fortunately for you. some mad lads out there actually do make things to benifit the game, that the devs wont.
https://helltides.com/ Countdown timers! (also shows mystery chests!)
Enjoy.
Thanks so much. That’s a cool website.
Yep used it when I was playing, so i didnt miss out on bosses. and didnt have to manually hunt down and look for those bloody chests…