You CAN do this in under 40 minutes - actually much less! Start with the basics - think about the supplies you need for the bath (soaps, dish pan, barrier creams/lotion, several washcloths and towels, etc, and the patient gown) then think about the supplies to make the bed (fitted or bottom sheet, draw sheet, pad, top sheet, blanket, pillow cases). Once you can remember all of that then move on to thinking about the bath and when to use a fresh washcloth/water, correct direction for wiping (clean to dirty), keeping your pt dry and warm and making sure skin folds are dry before moving on, applying motion and/or barrier creams, and doing your skin assessment as you clean each area. It sounds like a lot, but you are checking skin is you go, so the skin assessment isn't separate. I've seen a lot of aids who wipe bottoms without really looking at the bottom - you can't tell if there's a skin breakdown without that!
Adaptations you can make to this include giving the pt a washcloth and asking if they would like to wash their own face and peri area - some would prefer this but you may have to do a simulation of actually doing it for school. When we did our simulation we basically talked our way through it - showing the motions that would be used and when you got to peri area you said that for a female you would open labia and wipe from front to back using a separate are of the cloth for each stroke. That's really they kind of thing their looking for, as well as providing provicy for the patient and telling them what you are doing before touching.
Hope that helps. Like someone else said, practice it at home, even if you have to practice on a doll!