It usually depends on your schedule if your busy and work late I'd say 7-10 hrs but if you are a normal average person 8 hrs will do the trick
Answer – 20 percent
A Blood Alcohol Level (BAL) of .12 reduces the distance a pedestrian can be seen by a driver by about 20 percent. Four standard drinks consumed during the first hour of drinking, will increase a person's BAL to about .1%
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Post the picture in the comments because I don’t think your picture uploaded