Another factor with bochet is how caramelized/burnt was the honey. If you scorched the honey for 3 hours and had an SG of 1.100, I would not be too supprised at an FG of 1.030, but I it was a gentle simmer for 1 hour, and an SG of 1.090, you've obviously got a stuck ferment.
OG, yeast, nutrients, aeration, other practices (racking, temp changes, etc.) and current pH, all info will help.