Okay
@Fra****
, now that we've sussed out WHAT "retirement visa" you're on <- which is Non-Immigrant Type O-A visa that you got from a thai consulate in your country BEFORE you came here let's see if we can answer your question:)
Let's use this visa as an example
This is a year-long, multi-entry Non-Immigrant Type O-A visa issued on the 18 of Oct 2018 and valid until 17 of Oct 2019. You can see under the No Of Entry the word Multiple.
That means this visa is good for unlimited entries until the 17th of Oct 2019.
Every time you enter on that visa you will get stamped in for a whole year up until the visa itself expires.
What is the "valid until" date on your O-A visa and does it have an M or Multiple under the No of Entries ?