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I asked the lady from the airport passports office when I can go again. She said:
I have the right to be in Ecuador for 90 days in one year
That means, during one chronological year, I can stay in Ecuador 90 days, even if I leave the country and come back, meaning: if I arrived in 24 September 2018, and stay until in December, for 85 days, until 23 September 2019, I still have 5 days to use without visa or anything, just with my passport.
On 24 September 2018, I have again 90 days.
If I want to extend the stay, I can make a request to get 90 days more.