Hello Gustavo,
It depends on how it was set up during the installation of the environment but the default is 2 Weeks worth of data only.
Below is a link to more details regarding the log tables.
https://success.outsystems.com/Documentation/10/Managing_the_Applications_Lifecycle/Monitor_and_Troubleshoot/Logging_database_and_architecture/The_log_tables_and_views
Thanks.
-Jose