Oooh, interesting question!
I just pull the end of a (cotton) skein twice, if that makes sense? Turns out thats 60cm.
I like the neatness of cutting the skein at the end, and 30cm seems too short to me.
Im fascinated to hear so many people use shorter lengths!				
			
		I usually approximate around 14 inches (oh you Europeans and your metric system!)Any longer and I get knots, tangles, or bubbles.
				
			
		por lo general sobre 100 cm doblado a la mitad , quedando la a la hora de coser50 cm doble 				
			
		For cotton floss, I use 30cm (abt 12 inc) of 2 strands, made up of 1 long strand of 60cm doubled up.This is about 2 pulls of the skein (or 4 times the length of the skein).To minimise knotting, dampening the strand helps a lot.When the strand has dried, I run it thru thread wax (Thread Haven works as well i guess).
30cm (2 strands) makes 30 stitches comfortably.This includes the tucking in at the end of stitching.If I need to stop and restart, then no more than 26 stitches.
Cheers, p				
			
		Mine is always too long- so I am making an effort to make it only 30 cm- it does help a lot!				
			
		18 inches, or 45cm. Thats the length they cut em to in kits (in Canada, anyway). :loveliness:				
			
		By the way, those of you that measure thread the length of your arm might be interested to know if you measured to your nose its be a "dressmakers yard", i.e. about a metre ("meter" for our friends in America!)
It seems to be an obscure phrase: I had a lot of trouble finding an example online (and now I find I cant post a URL anyway!) 
Does anyone know the phrase? Im British, but I found it used on a forum on an Australian site, where everyone seemed to know what it meant. 				
			
		I use threads 120 cm bend half. With this measure strands I can embroider about 50 points. Note that Aida board 14.				
			
		50 cm for me				
			
		50 cm for me normal threard and 20 cm for metal