using all cd nodes except for timelost wisdom, and have 80% cd reduction from gear

You can get 200% from the Timelost Vitality, Traveller’s Fatigue & Traveller’s Frailty nodes, there’s very few instances of CD reduction in-game & they tend to be for specific skills, so with 280% CDRS you’d have a cooldown for VR of 6.3s (24 / 3.8).

I haven’t looked in awhile but my understanding was that each 100% cdr was essentially halfing the current cool down. IE → 24 to 12 with 100% 12 to 6 with 200% and 6 to 3.6 with 280%

No, it’s a simple formula: cooldown = current * (1 + (CDR/100)). Which means that 100% is half your cooldown and 200% is 1/3 of your cooldown.

Okay.

But there has to be something outside of that formula to explain my cd maul cool down because I’m getting lower cd than that formula would allow. I’ve had it as low as 1.2 seconds with less than 200% cd. While 200% would result in 1.33 according to the formula. Perhaps certain cd effects arent totalled?

73% from boots, 31% from belt, double opal 8/10%, 24% from leap tree, 10% from passive, and 20% from maul tree. According to the formula I should have ~1.45 second cool down, but it’s lower. Perhaps because there are cool down effects coming from two different skill trees applying to a third ability?

Sometimes cdrs effects from skills are coded as more (multiplicative) rather than increased (additive) either intentionally or by mistake. The only way to work out out if that’s happening is to exhaustively run through each node individually. The global cooldown node in Anomaly used to be a multiplicative modifier, for example.

thank you