how long does trich take effect to be infertile

I got the perfect answer. http://www.womenhealthzone.com/category/sexually-transmitted-diseases/trichomoniasis/

It's also important to note, you you must receive treatment as trich does not go away on its own:

Trichomoniasis is curable with antibiotics, typically Metronidazole (Flagyl). If you are being treated for trichomoniosis, keep these facts in mind:
* Use all the medicine prescribed, even if your symptoms go away
* Sex partners must also be treated, or you will get trich again
* Do not have sex until all partners have finished the medication

Long-term infection may cause changes in the tissue on the cervix. These changes may be seen on a routine Pap smear. In such cases, treatment should be started and the Pap smear repeated 3 to 6 months later.

In rare cases, trichomoniasis can cause pelvic inflammatory disease (PID) in women, which can cause infertility, chronic pelvic pain or ectopic pregnancy.

If a pregnant woman is infected with Trichomonas, it may cause premature delivery or low birth weight. Trich can cause small sores and inflammation, which can increase the risk of HIV transmission. Detection and treatment of a Trichomonas infection will help lower your risk of contracting HIV.

References:
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002307/
http://www.ashastd.org/std-sti/trichomoniasis.html
http://www.sexualityandu.ca/stis-stds/types-of-stis-stds/parasitic-stis-stds

Dear Anonymous,

Fertility is not something that is usually affected with Trich, Trichomoniasis can increase the risk of getting or spreading other sexually transmitted infections. For example, trichomoniasis can cause genital inflammation that makes it easier to get infected with the HIV virus, or to pass the HIV virus on to a sex partner. 

Pregnant women with Trich are more likely to have their babies too early (preterm delivery). Also, babies born to infected mothers are more likely to have an officially low birth weight (less than 5.5 pounds).

Please remember that if you are with a partner and you are treated for Trich then your partner must also be treated simultaneously-- otherwise, you will keep going back to your doctor to be treated because you continue to have sex with the same person. 

Good Luck and please be more careful during sex--it isn't worth getting infections or worse diseases,

Rosa