The Turkish visa is based on the "Schengen" visa. The Schengen countries are European countries which do not require a visa for visitors from the other countries. However, to enter any one of those countries, one must have a "Schengen Visa." It is from the Schengen Visa that the 90-in-180 days rule originates. Turkey's visa system is based on this European system.
To know if you have exceeded your 90 days, you must "count back" 180 days. If the total time of your stay in Turkey has not exceeded 90 days in the previous 180 days, then you may remain in Turkey until you reach a total of 90 days in the previous 180 days.
Let's say it's October 1st. You want to know how much time you have on your visa. Count back 180 days from October 1st . You will see the date 180 days previously was April 4th.
Next, look at the entry and exit stamps on the pages of your passport to determine your total number of days in Turkey on and after April 4th . It doesn't matter how many times you have come and gone from Turkey, you just need the total number of days in Turkey.
Take that number and subtract it from 180. The result is the number of days you may remain in Turkey.
Important: The 180 days is a "moving" 180-day period, so on any date you do this calculation, it always concerns the previous 180 day period. .
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