That would depend on the type of food. If the food is complex then it has to be digested and broken down into molecules that can be absorbed across the intestinal lining. This will take time and the process would be gradual (lasting hours).
However, if the food was pure glucose no digestion would be needed and the molecule would be available in the blood in a few minutes.
8 hours
To take the nutrients out of food and let them be abosered into your bloodstream
If you mean "we humans" - we take in energy by the food we eat. That food contains chemical energy.
Most chemical drugs are out of your bloodstream and urine in 3-4 days.
As long as you can hold a sh!t.
A few minutes
If you used Xanax only once, then it will most likely be gone from your bloodstream in 3 to 5 days. But if you take Xanax frequently, it will take 4 to 5 weeks for it to be gone from your bloodstream.
Iungs
humans take food in order to have energy that will enable them to carry out processes of life e.g cellular respiration requires energy that we get from food.
1 hour
their chloroplast take sunlight, and make it into energy, then make energy into food.... so they store there food as either: a. energy b. food
The time it takes for an antibiotic to absorb into the bloodstream depends on how it was administered. If it was taken orally, it usually takes about 20 minutes to enter the bloodstream. Through IV or injection it happens much sooner.