Tax auction vacant lot redemption period?

[Cindy Alaniz]

This is my first time doing something like this. I was very nervous but I did some research before attempting to buy anything. So,  it's a nonagricultural lot in Montgomery TX that I purchased from the tax auction in November 2019. The deed that I found was dated 1984 and nothing else. I'm wanting to sale it. What is my redemption period, 6 months or 24? Is there something else that I need to do before selling?