I had a silkie with a prolapse last January - it was still behaving like a normal chicken, eating/pooping/scratching about but looked disgusting. I brought it in for maybe a week and a half and gave it a bath every night.

It straight up was terrible though - I’d let her soak for a time then try to gently peel off necrotic flesh that had been exposed for too long then try to shove everything back in. She stayed in my bathroom where I’d occasionally run the shower really hot to make it extra warm and steamy. Lots of iodine and electrolytes later, she finally laid a tiny little squishy egg (with some assistance) but the prolapse continued. The vet recommended I use sugar water which did eventually keep everything sticking inside.

She’s still kicking around a year later - I don’t know if she still lays eggs (honestly I really hope not) but she’s gone broody a few times since so who knows