Almost precisely!

Bit skeptical by the previous reviews, I still decided to go for the product and must say that it really excites me so far! Therefore now here also my first entry of this type.
With us, the sand runs through fine and the times agree almost exactly (5 seconds to 5 minutes, you can loose cope). About the longevity can be after a day nothing to say, but they have already survived multiple drops by children. Perhaps we had Luck but we are very pleased with these hourglasses.