I'm asking for a specific number or weeks/or days of the infectious stage of Toxoplasma gondii in cats.
According to Epidemiology of and Diagnostic Strategies for Toxoplasmosis, a Toxoplasma gondii oocyst can survive up for more than a year in a moist environment due to the nature of its cell walls.
However, a cat can only spread the parasite via feces for 1-3 after infection.
Links:
Article Epidemiology of and Diagnostic Strategies for Toxoplasmosis
http://ref.scielo.org/ccrcxf
https://www.cdc.gov/parasites/toxoplasmosis/gen_info/faqs.html
During a primary infection, the cat can excrete millions of oocysts daily for 1-3 weeks. The oocysts are very strong and may remain infectious for more than one year in warm humid environments.
The Oocyst of Toxoplasma parasite does not become infectious until 1 to 5 days after it is shed in a cat's feces.
Toxoplasma gondii oocyst can survive up for more than a year in a moist environment .
Once sporulated and when properly stored (not too dirty with fecal material and in 2% sulfuric acid solution at 4 degrees) they can remain viable for years. In my hands even after 3-4 years some oocysts are still infective. I recommend checking their viability though, as the % of viable ones would be low after 1-2 years. There are some publications covering this issue, for example: Article Toxoplasma gondii Oocyst Survival under Defined Temperatures
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