Hygiene & Habit Timers
Enter when you last washed your jeans, washed your bed sheets, got a haircut, and cleaned your water bottle. See exactly where you stand on each hygiene threshold — with bacterial colony estimates.
Bacterial growth estimates are based on published microbiological research. Bacteria on unwashed jeans double approximately every 20 minutes under warm conditions. Water bottle biofilm studies show bacterial counts exceeding toilet seats after ~72 hours. Thresholds are indicative, not medical advice.
Hygiene & Habit Timers applies actual textile science and microbiology to four everyday habits — jeans rewear cycles, bed sheet washing intervals, the perfect haircut window, and water bottle bacterial growth. Enter the date of each last event and see a live status for each: whether you are in the safe zone, approaching a threshold, or well past the point where science would like a word with you.
How to Use Hygiene & Habit Timers
- Enter the date you last washed your jeans, changed your bed sheets, got a haircut, and washed your water bottle.
- Each timer calculates your current status against research-based thresholds and shows a colour-coded progress bar.
- The bacterial colony estimates are order-of-magnitude approximations designed for impact rather than precision. They are accurate enough to be uncomfortable.
Frequently Asked Questions
How often should you wash your jeans?
Levi Strauss CEO Chip Bergh famously wears his jeans for months without washing to preserve fabric integrity. Textile researchers suggest 5–10 wears before washing for most denim. Microbiology research from the University of Alberta found no significant health risk from extended wear — but bacterial colonies do grow substantially after 15+ days.
How dirty are unwashed water bottles?
A 2024 study found that reusable water bottles can harbor more bacteria per square centimetre than a toilet seat after 72 hours without cleaning. Biofilm — a protective community of bacteria — begins forming within 24 hours. This does not necessarily cause illness, but the numbers are striking.
What is the perfect haircut window?
Most hairdressers and barbers describe days 3–7 after a cut as the optimal window — the haircut has 'settled' from its initial tight shape and has not yet grown out significantly. This varies by hair type, growth rate, and style.