Thick cored longbows will tend to set if strung for long periods. I left a Schulz strung for three months and it had less pull and lost some of its shape for a while, but it came back after a few days of being unstrung. I was checking to see how stable it was after I fell with it and broke a tip, then retillered it to its two inches shorter length. It is the smoothest and most accurate short draw longbow I own in its current sad state. I have seen a Hill that had been left strung for two years that took on a permanent set and lost a few pounds of draw weight, but it probably shot nicer and was easier to pull for its owner, originally 92 pounds.