Ok, the Erebos worldquest seems to be a little more complicated than I anticipated. I will try to explain it again:
With the repolarization of the first barrier the world has 24 hours to either repolarize another barrier or bring a certain amount of hell crystals.
The repolarization of another barrier resets the time and the 24 hours start anew. This can of course only work until all barriers are open.
If the 24 hours run out without the opening of another barrier, then it is checked if enough hell crystals were delivered to sustain the open barriers. The number of hell crystals depends on the number of open barriers and the time they were kept open continuously.
With the opening of the first barrier a base upkeep of 50 hell crystals is needed. This upkeep is raised by 20 for every additional barrier opened. Every 24 hour period the barriers are kept open without a new one repolarized, the upkeep is raised by 30 hell crystals. Every time an upkee
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