They will return to normal size not long after the high is over. How long the high lasts depends on how it's administered.
your pupils can stay small through the whole time you are on heroin. you feel the most intense part of heroin in the first four hours but after that heroin is still in your system and it still effects your pupils. id say it depends on how much you have in your system, could last all night. your pupils could be small 8 hours after and slowly gain there normal size after more time
It depends quite heavily on ones tolerance to the drug. Pupils will generally stay constricted for the duration of the euphoric experience. Depending on quantity and quality of the heroin, and as I said the higher a person's tolerance, the faster they come down which is when pupils will return to normal size.
Forever
Don't do it!!!
24 hours
how long does it take for heroine to be negative in a hair strand test
try bathing
48-72 hours
3 days
3 - 5 days. mostly 3.
Heroin will stay in the urine for 3-5 days
No, normally not. With me, my pupils stay the same.