Dd19 likes having very long hot showers - she'll often be in the shower for 30-45 minutes.
Dh gets very angry about this because of the cost of the water and because sometimes she uses up all the hot water and he can't do the washing up.
They had a massive argument when this happened yesterday. He says that she can't spend more than 5 minutes in the shower any more. She says she'll have her shower when no-one else is at home and she'll give us part of her student loan to pay for it. Dh says that she's 'missing the point'.
Who is being unreasonable?