Hair transplant in less then 3 days-just quit smoking. Is 24 hours sufficient time?

24 hours should be fine. The issue with smoking and any dermatology procedure is that nicotine is a vasoconstrictor and can interfere with wound healing. The most important issue is not smoking for the first week or two after the procedure, not before the procedure.

Thank you for your question and photos
the number of grafts a patient will need depends on the thickness of their hair and the extent of their hair loss, which can be determined by the Norwood Scale below.
During a hair transplant, grafts are usually removed from the ‘donor area’ located on the back of the scalp and relocated to a balding area. The back of the scalp makes a good extraction area due to the high volume of hair follicles that congregate within that region that are not affected by the balding process. Specialist surgeons will remove a small amount of tissue that can grow hair and relocate it to the desired area of the head without damaging them.