Unfortunately the effect of temperature on a tortoise's sex was unknown during the first years that Radiated tortoises were bred. A female tortoise is generally sexually mature between 8 and 12 years old or older. Female tortoises have laid eggs every month of the year. Typically once a female starts producing eggs, she will lay 3 to 5 clutches per year. Clutch size is usually 3 to 5 eggs, but clutches of 6 and 7 eggs have been recorded.
Fertility is typically low.
It is not uncommon for eggs laid during certain months of the year to be completely infertile. Hatching time can vary quite a bit even within the same clutch -of eggs. Zovickian's first eggs hatched at 145 days, but I have heard of eggs hatching after 300 days of incubation. The Radiated tortoise is a very hardy species and doesn't suffer from very many ailments or stress. It is wise to keep them separated from other species, as is recommended with most tortoise species.