What are the consequences of overstaying your Bolivia travel visa?

Hello, I was just wondering what would happen if you end up staying in Bolivia longer than the visa permits? would you get jail time? The reason I ask is because I am going to Bolivia for 4 months to volunteer and it requires a special purpose visa, and I read in a website that it may take 2 weeks to 4 months to process the extension of the visa.

Thank you in advance