Sherpa eVisa Help by Destination Mexico How long is my Mexican eTA valid for? Tessa November 22, 2022 20:13 Your eTA is valid for 30 days once it has been approved. Related articles How long does it take for the Mexican SAE to be approved? How long is my Oman eVisa valid for? What's the difference between an eVisa and an eTA? How long can I stay in Mexico with my eTA?