Bleach is an antibacterial that will kill germs on contact in the proper concentration. The longer you allow the bleach to sit in the lines and tank, the more of the bleach scent will remain. Myself personally, I leave it in one hour and then flush the heck out of the system.
2010 Silverado 5.3 3.73 EC Superchip, AEM Air Intake
2013 Jayflight 26RLS
2 Fur daughters
....and empty pockets