Weapon Item Effect - Dazing III; How does stacking work?

[digitaljc]

From item description Dazing III:

On-Hit: Your target suffers a -1 penalty to Will Saving throws for 6 seconds. This effect stacks up to 5 times. This effect may only occur on-hit once every three seconds.

Perhaps I'm just really sleepy but based on the description above, how can this weapon effect stack up to 5 times for six seconds each if the effect can only occur on-hit once every three seconds?

[AbyssalMage]

From item description Dazing III:

On-Hit: Your target suffers a -1 penalty to Will Saving throws for 6 seconds. This effect stacks up to 5 times. This effect may only occur on-hit once every three seconds.

Perhaps I'm just really sleepy but based on the description above, how can this weapon effect stack up to 5 times for six seconds each if the effect can only occur on-hit once every three seconds?
Each player carries a weapon with the effect making it easier for CC casters so they placed a cap.

May also reset on hit(unconfirmed by me/theory), but NPC's tend to die before effects like this are useful. Just wasted developer time.

[FuzzyDuck81]

Hit 1, -1 to saves for 6 secs which starts ticking down
3secs later, a 2nd -1 is applied for a total of -2, duration is reset to 6secs, it starts ticking down again
another 3secs later, another -1 is applied for -3 total, duration reset to 6 secs, starts ticking down again
...and so on

Stacking effects like this generally work best on enemies with lots of HP that it can build up on, or if multiple people have the effect on their weapons, many mobs will die before it really shows much of an effect.

[digitaljc]

Thanks - now I get it :)