I'm not sure how many days in one of Neptune years but one of Neptune's days is 16 hours and 7 minutes long. And one year is 165 earth years so 365 x 165 = 60225 earth d â¦ ays in one Neptune year. 4 people found this useful. Answered.
Most rashes caused by poison ivy, poison oak, or poison sumac are mild and last from five to 12 days. In severe cases, the rash can last for 30 days or longer. Immunotherapy is not available for allergies to poison ivy, poison oak, and poison sumac.
How long does it take for the poison ivy rash to develop? The amount of time for a rash to appear after the initial point of contact with the poison ivy chemical varies from person to person. The first thing to consider is whether or not you have had poison ivy before and how allergic you may be to it. Someone who has had poison ivy before and is relatively allergic may start to itch and develop a rash within hours. Someone who is exposed to it for the first time may not develop a rash until 2 to 3 weeks after the initial exposure.