Once you cast the FO every cast Ice Lance adds a stack to your buff, up to 10 stacks (which is rarely happening other than having all trinkets and Hero up, but that's not the point here).
Question: is it worth casting ice lance even w/o proccs to stack up the buff as high as possible and then cast your 3-5 frostbolts? Or should ice lance only be cast during frozen orb uptime when you have the proccs?
Side question/discussion: With 4PC this will be easier I guess, generating a procc every 2.5 seconds? Same as above though, in case here are not enough proccs.
I correct you: every lance resets the timer. And each lance increases the buff, making the FB 2 seconds faster and 2% stronger each stack. Reaching 10 w/o the 4PC and possibly a lot of haste is really hard.
Also you get usually 5-6 frost bolts with +20% damage out.
I can see that everyone seems to be rolling in the "Fire/Arcane" thanks to Blizzards idiocy. However, I am sure there are some talented frosties out there that could answer the question - or may be in search as well