What sort of sailing are you doing?

For me, long is good. I use 24" on my wave sails. I'm 6'1" (using waist harness) I find longer lines keep the sail nice and upright, giving me plenty of power and still allows me to keep my weight over the board. For my race sails, I use 26" and 27", this allows me to hang out more (weight off the board), while keeping the rig up-right for the power...

PW

I'm 6', mainly sailing flat to heavy chop - but as I said I'm starting to get into loose B&J sailing, when conditions are there. Maybe I need to concentrate on a much more upright stance.

DavMen

Longer the better as it keeps your rig up right. You just have to remember to lift your bum over chop at times

whos Max?

26inch lines.

Longer lines i find are better because they allow you to move around more while still hooked in. say when going over white water or jumping. also when jumping in the harness. with short lines i find you tend to break booms but with longer lines i haven't even bent one.

short lines like 20 inches feel really stable and solid but you just don't have enough movement.. well thats what i find

Comrade Dav
I having the boom set to about 2 fist widths from top of cut out.
I have been tolding this is quite low for tall person but I like having boom around abouts chest height not shoulder height, unlike many others.
This also working of the good when I sail with shorter comrades who wanting to trying of gear... easy step on step off with no rig adjustingments of the required.
Maybe this Russian leader MAX you speak of is same person as my imaginary comrade.. he too was crazy for certain... I thinking maybe you missing of the R in his name.
My friend MAX his third naming is also of having the R
His last name is soul.
Often after doing things he telling me for doing and I breaking of gear or pride I using of his full name for addressing of him with all of his names like as follows:
Max
U
R
Soul - Why for you telling of me for doing this... I must be crazy for sure listen to you again.

Kremlin i think you need a new imaginary friend this one (MAX) sounds like he's costing you a fortune in broken gear, and the kook factor you cant allow that to be happening

Well yes thats another way Pugwash and alot cheaper than my way.