How long does a wound takes to heal! after cutting a boil open?

Depends on many: Factors: size of wound; depth of wound; location of wound; pt's overall state of health (diabetics often take longer to heal). If lanced boil, size of abscess, how long it takes to drain, whether antibiotics r used, quality of wound care.

It depends...: Small wounds should take only a few days to heal. Healing however depends on a variety of factors including: age, general health, circulation, infection control, and nutrition.

Superfast healing: The real question is what not to do that slows down healing. Avoid using alcohol, peroxide, hibiclens, betadine, and bleach solutions. Inflammation ( red, hot, swollen, tender) is important to healing so anti-inflammatories (motrin, advil) are bad. Cover the area with a clean dressing changed every other day and protected from trauma. It will heal as fast as it can using these tricks.