I let it run overnight, so I'm not sure at what point the image converged at an acceptable noise ratio (~3%), but it's true the image is rendering slow (Threadripper 2950x, 64Gb RAM).
- hair is probably using a more complex material than it needs to
- plaid is using a more complex material than it needs to
- could probably run a rayswitch on the chair metal to speed up the GI calculation
Really my issue is with the blanket, which I think is using an SSS + displacement + opacity; probably overdoing it and just need to balance the falloff in the diffuse channel. Right now the plaid material looks like gauze or a sponge or something :/