How often are damage over time effects applied?

I'm not clear on how often damage over time (or healing over time, for that matter) affects get applied. Take, for example, the following spell:

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I have to assume that raising the base duration up to 13 seconds is actually an improvement, as opposed to making the same amount of damage take longer. So how often is damage over time applied? Every second seems too much. I've seen some things that suggest a combat round is 6 seconds, so it it being applied every 6 seconds? If so, what happens if you have a duration that's only 10 seconds, or 13 seconds? Do you get partially applied damage for the fraction of a 6-second round that it was?

I'm having a hard time determining the value of DOT spells without understanding the mechanics.

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How does damage over time work?

Damage over time kills from non-character sources like minions and totems will give the kill and any on kill effects to the owner of the totem or minion. This is a limitation of the game and not an intended game mechanic.

How does damage over time multiplier work?

The DoT multiplier is a More multiplier to damage over time. Different DoT multipliers are additive with each other, even if they apply to different types and sources of damage over time, so long as they apply to the DoT in question; the damage over time is then multiplied by the resulting sum.

Does increased damage over time affect bleeding?

Bleeding, or bleed, is an ailment that deals physical damage over time to the affected target. Moving targets suffer increased bleeding damage. Only physical damage hit can inflict bleed. As of current build of the game, all chance to bleed are grant to the weapon as local mod, or the chance is specific to the attack.

What is a DoT effect?

Damage-Over-Time (also called DOT) are status effects in the game. They continuously deal damage to opponents suffering from them.

Unity Status Effect System With Scriptable Objects | Damage Over Time, Movement Penalty

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