Because Brain surgery is very complex and intricate. Theres a ton of cells, nerves and everything else.. Would you really like them to do brain surgery on you in under an hour?
Steroids are used to reduce inflammation in the brain after surgery. You should take them as long as your doctor prescribed them. If you are unsure, then ask your doctor.
Open Heart takes 6 hours
It takes twenty-four hours.
7.416666666..... hours (seven hours twenty-five minutes).
bending may take place as soon as 5 hours after toe surgery.
About twenty hours.
Twenty three hours
20 minutes at 60 mph
Around twenty hours.
At least twenty three hours.
By car, it will take you about 21 and a half hour. On foot, it will take you 9 days and twenty hours. Non-stop of course.
This is because it does not take 24 hours for the earth to be in exactly the same position it was in 24 hours ago.