How to actually maintain Enochian?

[Rongway]

Enochian will never fall off if you're using the <Lv60 rotation, since Enochian's maintenance condition is exactly "maintain Astral Fire or Umbral Ice", and Fire (I) and Fire II refresh the AF timer.

If you're having trouble maintaining it once you learn Fire IV, swap a Fire IV and a Fire. Fire and Fire IV cost the same, so shuffling them around doesn't affect your time-to-OOM. You should be able to do 4-4-4-1-4-4-4, but if you can't, do 4-4-1-4-4-4-4. It's the same cost, and since Blizzard III's cast time is half during Astral Fire III, fitting it in to the last couple seconds of Enochian shouldn't (shouldn't) be a problem.

If bad pulls or mechanics disrupt your rotation and your timer's running low, cast the tier 1 spell of your current element to extend the timer.