Maybe an hour when I first get it to full brace, then an hour here and there while I am tillering
it . I rarely leave it braced while I am tillering. I always check it/mark what I want to do and unstring. Make my scrapes or any adjustments I want and brace it back up.
Not sure that is the proper way but rarely have one change weight or tiller once it is finished unless the wood isn't seasoned well. I hardly ever use wood less than 2 or 3 years old and prefer it to be older if possible.
I know some say dry is dry but I feel other wise.
OPPS another can of worms.
Pappy