The magic system in Heroes V [Discussion]

Here's a question that arose: there are several spells that have a duration... Before, they lasted for a certain number of rounds, but now, with the removal of rounds in combat and the introduction of the action time bar (ATB), does anyone know how the duration of a spell will be measured? :confused: :eek: After all, the speed of unit movement on the ATB constantly changes due to morale and pressing the "defense" button, i.e., there is nothing constant left in combat that could be taken as a unit of time... So, here's the question.