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Production of sufficient immunologic memory typically takes a few weeks following the initial antigen exposure.
12 hours
If the level of exposure is low and constant, it can actually take years of lead poisoning to cause death. It the exposure is high, it may take weeks or months.
It depends on the camera and the lighting and what you mean by "olden days." The first photograph ever taken took eight hours of exposure.
Tanning is a result of exposure to sun rays. When skin gets exposure to UV rays melanin production increases. There are number of methods to remove tan, but it can take long.
Well.. Exposure is how long the camera takes to take a picture. A long exposure time gets a better and higher quality image when the camera is still. A short exposure is when the camera may move or something in the picture may move. So to keep it from blurring the camera captures an image for a fraction of a second. Auto exposure does this automatically analysing whats happening in the picture to create the best of both worlds basically.
How long did it take Galileo to make the first telescope?
Asbestos-related diseases appear from 10 - 40 years after the exposure begins. How long a delay there is depends in part on how intense the exposure is and how long it lasts or how often it occurred. And some exposed people never develop an asbestos-related disease.
Symptoms of the disease do not usually appear until 15-20 years after initial exposure to asbestos
take off your clothes to gain exposure
how long does it take for a burn to heeal?
Well some long term effects are damaged eyes and of course skin cancer which can be fatal if you don't take care of your skin.