If you're looking for actual instructions on how I shower quickly, here goes:
-Step in shower and put face under spray. Use face scrub first. While rubbing face scrub into face, turn around and wet hair for shampoo.
-While rinsing face, shampoo hair. If using conditioner, put in immediately.
-While rinsing hair (or letting conditioner sit), soap up body. This often requires a leg up on the shower wall to soap while rinsing hair
-Rinse body (and hair, if conditioner was used). Every couple days, run a razor on legs or pits while they're soapy.
Done! I can do it in 5 minutes. The only time I take longer, 'relaxing' showers is on the weekends.
You can do it! Maybe aim for doing substituting one "quickie" a week for a few weeks, so it's not as traumatic for you as going cold turkey might be
. I'd still allow yourself a couple long ones a week so you can keep that self care time.