Appeal deadline questions after an unemployment denial after 10 years as an IT help-desk technician

My claim was denied after 24 weeks of waiting, and the letter says I have a short window to appeal. This is my first time dealing with any of this. I have not done a hearing before and I am nervous.

Thanks for writing this out. I went through something close to it 2 months ago, and it got easier once I kept a simple log of every call and form.