about 24 hours at 350lbs
I pre stretch for 1 hour then 8 hours for main shooting string and 4 hours for cables all stretch at 400 pounds using bcy 452x
About 10 minutes total, but with stretching/releasing about 10 times @ 300lbs.. seems to work a bit more consistently (for me anyway)
I have buddies that don't stretch at all or very little. The only stretch the string get is during the serving process. He gets good strings out of his process. Thanks for your input.
@bap728 this way tends to even out the strands, and means that a set of strings/cables can be done in a commercially viable time.. and in one sitting, rather than taking them on/off the jig..
20 min pre twist. 30 min post twist.
There's a lot of misconception in stretching. As a professional string Builder one who makes a living off of it. Overstretching kills a string. It depends on a string material but mainly we layout a string and stretch it 20 mins at 375 lbs. Then twist and serve at 375. So over all time for stretching would end up being 40 minutes. And out of the thousands and thousands of strings to go through our doors we may have one come back over 4 to 5 year period of time.
I only stretch as I serve. I use to let my string stretch as long as a day or two but I haven't noticed any difference in an hour stretch to 30 hours stretching.
All I do is keep an eye on the length of the string and knowing the material I'm working with. You can tell when it's done stretching. Once it stops elongating, it's done stretching. I then let it relax then crank it back up until it won't budge, then serve.