I did it last year and it was soooo much fun
It will be cold up there so make sure you stay warm. I wore compression tights underneath my running shorts and a compression shirt underneath my sleeveless. I wore gloves and I found that it helped on certain parts because it'll prevent your hands from getting cut up. Make sure your sneakers are knotted up nicely because you'll be waist deep in thick mud. I saw several people lose their shoes or fall face first in the mud because their foot got stuck. You DO NOT want to lose your shoe because you're going to be fucked if you do.
Do NOT listen to the staff if they tell you that their ice tank is 'warmer'
Just remember that it's all about the comradery of being able to finish the thing together with all your friends. Time doesn't matter as long as you guys have fun doing it. The warm up speech at the start was absolutely amazing. Seeing everyone chant together and strangers high fiving and hugging each other
The half pipe was FUNNNNNNN
The end is a lot of fun as well because that's where they'll shock you. Don't be a pussy and just run through that thing like a boss (and hope you don't get shocked and eat a mouthful of mud
)