Life leech

Hi. Can someone explain life leech mechanism please ?
My main skill deals 1800 dmg. Does "2% life leech" means that i get 1800*0.02 hp when my skill hits a target ?
Lvl 59 ranger.

Right, and you get it at a rate of 20% of your health per second.

So, 2% of 1800 is 36, and if your life is 3000 it will take 60 miliseconds to transfer to your health pool. Multiple leeches can be active on you but they don't stack, if you triggered another leech within those 60 miliseconds it will continue once the first one expires, and if you do multiple hits at the same time it will effectively grant you life only for the biggest of them you did.

You got basic stuff like that on wiki, by the way.

Ok i understand. So Life gain on hit is better then life leech.
Thanks.

Life leech from jewelry and passive affects only physical damage. If you are using the support gem it will work for spell or weapon elemental damage.

LGoH is generally better if you are doing large aoe on packs or if you have a very fast attack or one that hits more than once per attack like Cyclone. If your attacks are slow, leech often works better.