Hi Raquel,
One simple approach that you could use would be to create a specific group which protects the material for that time frame.
For example, if you were to provide protected material for the month of October in2024, you could create a group named “20241001 to 20241031” and protect the corresponding entries by assigning them to that group.
For those who should be able to access the material, you would assign the users to that group. If they should not have access after a certain amount of time, you would then remove those users from the group.
There is also a premium extension which allows to drip content (links to documentation page), but it does not cover your specific requirement “only have access to the material generated between those two dates”.
So maybe the way I’ve explained above would be appropriate for your case, please let me know if that helps or if you have further questions.
Cheers!