If you're suffering from your first yeast infection, and you're wondering how long it will last without treatment, it will last forever. The mutated Candida yeast is a fungus that burrows its way into your skin, and than feeds off of the cells of your body. The longer it's left, the deeper it gets, and then it will be more difficult to cure.
If this is happening in your intestines then the Candida fungus will soon perforate your intestines which then allow toxins ( given off by the Candida ) to enter your bloodstream. Your symptoms will become more widespread then, and include...
Aching muscles and joints
Memory loss
Concentration problems
Recurrent yeast infections
And many more
If you're trying to cure your yeast infection and it hasn't been cured within a week you should first go back and see your doctor. Your doctor can make sure you have no obvious health problems. Health conditions such as diabetes and hormone imbalances can cause recurrent yeast infections.
Once the doctor has made sure you have no health problems you then to find the real cause of your yeast infection yourself. Your vaginal yeast infections symptoms are just a sign that something else is wrong. And while you're continually treating this one symptom the cause is not being dealt with.
The main cause for stubborn yeast infections is antibiotic use. Antibiotics kill all your bodies natural defences against bacterial infections, and they also weaken your immune system. Antibiotics will wipe out all your body's friendly bacteria that is there to fight off other pathogens like the mutated Candida yeast.
If you have used antibiotics a lot in the past then this could be the reason you have a stubborn yeast infection, and you have a big chance of having an intestinal yeast infection. If this is the case then your yeast infection could take anywhere between a few weeks and a few months to cure. In extreme cases of intestinal yeast infections it can take over a year, but this will depend on the individual, and how strict they are with their anti Candida protocol.
The quicker you discover the real cause of your yeast infection the faster you will get your health back.