Your body will replace the blood volume (plasma) within 48 hours. It will take four to eight weeks for your body to completely replace the red blood cells you donated. The average adult has eight to 12 pints of blood. You will not notice any physical changes related to the pint you donated.
http://www.giveblood.org/faq.aspx
If all blood donors gave 2 to 4 times a year, it would help prevent blood shortages. If you began donating blood at age 17 and donated every 56 days until you reached 76, you would have donated 48 gallons of blood. About three gallons of blood supports the entire nation's blood needs for one minute. Blood donation takes four steps: medical history, quick physical, donation, and snacks.
https://www.bnl.gov/hr/BloodDrive/56facts.asp
Drink up. Blood volume makes up approximately eight per cent of your body weight. About 55 percent of blood is comprised of plasma, of which 90 per cent is water. So although you donate less than a pint of blood at a time, almost half of this is water.
https://www.quora.com/How-long-does-it-take-for-the-human-body-to-replace-a-pint-of-donated-blood
Most people feel fine after donating blood. A unit of blood (500 ml) is a little more than a pint, and the average adult body contains 10 to 12 pints of blood. Your body makes new blood constantly, and the fluid you give will be replaced within hours. Eating a full meal within four hours before donating will help you feel strong after donating.
http://www.giveblood.org/faq.aspx
During a whole blood donation we aim to take just under a pint (about 470mls) of blood, which works out at no more than 13 per cent of your blood volume. After donation, your body has an amazing capacity to replace all the cells and fluids that have been lost. Take red cells.
https://www.quora.com/How-long-does-it-take-for-the-human-body-to-replace-a-pint-of-donated-blood
You must wait at least eight weeks (56 days) between donations of whole blood and 16 weeks (112 days) between Power Red donations. Platelet apheresis donors may give every 7 days up to 24 times per year. Regulations are different for those giving blood for themselves (autologous donors).
http://www.redcrossblood.org/donating-blood/donation-faqs
Fewer than 1 in 10 actually donate. Approximately 40,000 pints of blood are used each day in the United States. Approximately 1 out of every 7 people entering the hospital needs blood. 1 donation has the potential to save as many as 3 lives. 3 teaspoons of blood can save a baby's life.
http://www.bloodsource.org/Donate/Blood-Facts-FAQs
The average adult has about 10 pints of blood in his body. Roughly 1 pint is given during a donation. A healthy donor may donate red blood cellsevery 56 days, or double red cells every112 days. A healthy donor may donate platelets as few as 7 days apart, but a maximum of 24 times a year.
https://www.quora.com/How-much-blood-can-a-human-donate-in-a-day
(For a whole blood donation, it is about 8-10 minutes. If you are donating platelets, red cells or plasma by apheresis the collection can take up to 2 hours.) When approximately a pint of blood has been collected, the donation is complete and a staff person will place a bandage on your arm.
http://www.redcrossblood.org/donating-blood/donation-faqs
Just one pint of donated blood can help save as many as three people's lives. The average adult has 10 pints of blood in his or her body. One unit of blood is roughly the equivalent of one pint. Blood makes up about 7% of your body's weight.
https://www.bnl.gov/hr/BloodDrive/56facts.asp
how many pints of blood do you donate
You donate 1 pint of blood. You should donate 1 pint of blood.