I got some rooting powder, but it says it is for hardwood.... #3. will it still work to help root clones?

Yes..but Be Sure To Make Sure The Cut Part Of The Clipping Is Not Exposed To The Air Once It Is Set Into The Rock Wool. This Iswhy I Prefer A Gel Like Clone Ex Because It Protects The Cut Zone.

im using rapid rooters, i guess i will just make sure its stuck in deep, this is my first time cloning, and more of just a test..... hopefully they will root

Just Spray Them 2 Times A Day If You Do Not Have A Dome To Cover Them With And Do Not Let Them Dry Out. You Should Be Able To Root At Least 75%

how long does it usually take to root clones? also which are easier to root, smaller less developed branches or thicker bigger ones?

the thickness of the branch shouldnt matter. what you need is at least 2 nodes above the cut and a few leaves. for the first couple of days they will droop over and eventually recover. it can take between 5 days and 3 weeks to root