It is difficult to predict the exact incubation time for turtle eggs. The hatching date depends on variables such as the temperature during incubation and the depth of the nest, for example.
In the Maldives, sea turtle nests incubate for approximately 49 to 62 days, whereas in colder regions around the world incubation can take up to 80 days.
In Kenya, turtle nests take between 40 and 73 days to incubate before hatching, varying between different nesting seasons and beaches along the coast. The shortest incubation period was recorded on the northern part of the coast.
Incubation time in Iran, in the Gulf of Oman, is at mean 61.7 days.
References:
Hudgins JA, Hudgins EJ, Ali K and Mancini A 2017. Citizen science surveys elucidate key foraging and nesting habitat for two endangered marine turtle species within the Republic of Maldives. Herpetology Notes 10: 463-471. Matsuzawa Y, Sato K, Sakamoto W and Bjorndal KA 2002. Seasonal fluctuations in sand temperature: effects on the incubation period and mortality of loggerhead sea turtle (Caretta caretta) pre-emergent hatchlings in Minabe, Japan. Marine Biology 140: 639-646. Okemwa GM, Nzuki S and Mueni EM 2004. The Status and Conservation of Sea Turtles in Kenya. Marine Turtle Newsletter 105: 1-6. Olendo MI, Okemwa GM, Munga CN, Mulupi LK, Mwasi LD, Mxolisi Sibanda HBM and Ong’anda HO 2019. The value of long-term, community-based monitoring of marine turtle nesting: a study in the Lamu archipelago, Kenya. Oryx, doi:10.1017/S0030605317000771. Sinaei M, Bolouki M, Ghorbganzadeh-Zaferani G, Matin MT, Alimoradi M and Dalir S 2018. On a Poorly Known Rookery of Green Turtles (Chelonia mydas) Nesting at the Chabahar Beach, Northeastern Gulf of Oman. Russian Journal of Marine Biology 44: 254-261.