I usually follow the formula of 21 days to lock in the sex. If you do choose to incubate at higher temps after you Temperature sex your geckos, do it gradually. Don't incubate for female at 82 degrees, then put them in a 90 degree incubator. You want to gradually increase the temp if you were to do this.So i heard that leopard gecko eggs are sexed within the first 2 weeks of incubation, and after that you can incubate at higher temps even for females. Is this correct?