Why wear a tampon for less than 9 hours?

Answer 1

Tampons should be changed every 4-6 hours - the longer a person wears a tampon the longer bacteria and toxins are accumulating within the vagina with thanks to the tampon, thus higher risk of vaginal infections and TSS.

Answer 2

Tampons have multiple negative effects on vaginal hygiene and health: prevent vaginal cleaning, effect vaginal pH making the vagina more favourable to harmful bacteria, give bacteria the perfect place to multiply, dry-out vaginal tissues causing tears that allow bacterial toxins into the bloodstream, and many tampons contain potentially harmful ingredients too.

The longer you leave tampons the longer you allow bacteria to multiply while preventing the vagina from cleaning-out that bacteria, remember too that bacteria multiply exponentially so a few hours over the recommended 4-6 hours can make a big difference. If you can go over 4-6 hours without leaking it would also mean you're using too high an absorbency, so increased vaginal tearing. Basically the longer you leave a tampon the higher the risk of infections and Toxic shock syndrome.