Split Panel Data to Implement GLS

Hi, new R user here. I have a panel data of 30 countries spanning 60 years and I wish to explore the impact of political institutions on economic outcomes. To this end, I would like to implement a GLS with random effects and time dummies. My problem starts with the next step. As the panel covers 60 years, I would like to set a time horizon of 15 years to have four panelS for each country. What is the most efficient way to implement this?

Thank you in advance for any suggestions!

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