From research I have found... It takes 3-10 days. It will also remain effective for long periods(over a year) as long as it does not become wet. It is also safe around humans & pets. But some reseach suggests that it is NOT safe around infants.
answered 1 year, 10 months ago
Do I need to mix it with sugar or the powder alone good enough to kill roaches?
asked 1 year ago
on Enoz Roach Away Boric Acid, 1 lb
The powder alone was good enough for me especially if you place it in the corners/cracks and areas where they hide. Within a week, I saw DEFINITE progress and even saw bugs with the powder on them.
answered 5 months, 2 weeks ago
We make "roach candy" by mixing with powdered sugar or regular sugar(powdered in blender) with a little oatmeal and water to make candy balls to place in cabinets and behind appliances and under bath sink. Works great!