Im from the U.S. I am traveling to Europe and my layover to and from Europe is in Turkey. Both layovers are over 12 hours long, so I’m definitely planning on doing the free tour Turkish air gives. My question is in regards to the Visa. Would one E-Visa be enough for both layovers? Like once I get to Europe will they cancel it out and I won’t be able to reuse it on the way back?

When I travelled to a country in Asia they stamped it saying cancelled or void I don’t remember, once I left the country, which is why I’m asking about the one for Turkey. Thank you for any advice.