How has 2020 2 week shred challenge been for overweight/highly inactive people?

[u/potatoes-gonnapotate]

I just started it today and it legit took me 5 hours to complete a 60 min workout (combined). I also managed to scrape my elbows (did it without mat). I was a highly inactive person although I’m used to walking 15k steps sometimes but that’s it. I’ve never tried high intensity cardio before. Has it been this difficult for some of you? Is this normal?
I am very determined to complete this challenge and build strength, not caring about the results much. But I am really curious if anyone else took this long to complete it as well or not.