Death Rattle? How long does it last before one passes away?

My grandpa is in his "final life stages". Today, he started sounding "flem like" and coughing a bit. I was unsure if this was just a conjestion from a cold or a 'death rattle'. I have never heard a death rattle, but the nurse came today and said she thought he was "getting... show more My grandpa is in his "final life stages". Today, he started sounding "flem like" and coughing a bit. I was unsure if this was just a conjestion from a cold or a 'death rattle'. I have never heard a death rattle, but the nurse came today and said she thought he was "getting close". His limbs are not turning bluish or cold and his breathing is OK. I just don't know how I am suppose to tell what this breathing condition really is. If it is a "death rattle", is this something that happens weeks, days, or hours before death? He is in his home passing, so there is no doctor to tell us for sure. Thank you anyone that may help.
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