Hello! I'm a NT parent of autistic child. My child takes a long time to do many tasks like grooming and homework. Showers, in particular, take an extraordinarily long time (an hour). We live in a drought-prone area so this isn't a "luxury" others take. Here, 10 minutes seems excessive. Homework can be accommodated. Showers need to be hurried. How?
It will depend on why the showers are taking so long. Are they in the shower for the whole time they're in the bathroom, or do they run the shower and then get distracted by going to the toilet, looking at a phone or tablet, etc.? If so it might help to talk to them about waiting to run the shower until just before they're ready to get in, to save water. Is it an executive dysfunction issue? Is your child finding it hard to remember or act on shower tasks (getting undressed, washing hair, washing body, rinsing)? If so, having a system, like a visual or written timetable of tasks as a reminder, or having the items your child uses lined up in their own area so that they can just use them in order, might help them to move along. Are they losing track of time? A timer, or having them listen to music in the shower might help (two songs per shower, for example). Is it a negative sensory thing? The change between dry to wet and back again can be challenging. The change in both dryness-wetness, and also the temperature change. Things like making sure the room is heated, getting them to run or jump around a bit before they get in the shower (so they'll be hotter and less likely to get cold before or after showering), make sure they have a warm towel). Is it a pleasant sensory thing? Do they like the feel of being in the shower, under the water, the sound, the smells of soaps and shampoos, or the warmth when in the shower compared to stepping out. If they need this time, but you cannot afford the water wastage, perhaps there could be an agreement that once a week they can have a longer shower to help address these sensory needs, and/or you could find a way that they can reuse water (allowing the bath to fill up as they shower, so they can reuse the water using a watering can or something, or going to the swimming pool so they can swim and use the showers there). Do they enjoy showers? If they like to shower daily, then the ideas above will hopefully make it a little easier to figure out what the issue is and how to address it. But if they actually don't like showering (but struggle to get out once they're in there) then perhaps showering less often (using other methods for maintaining hygiene in between showers like body wipes/strip wash) and allowing them longer showers when they do shower might be a good compromise. Maybe some of our followers will have other ideas. Or you can always message again if you want to include more information or I've missed something important. If you find my posts helpful, please consider a tip.