Our hot water is on for 30 minutes a day. I shower daily, dc every other day. It can be a battle to get teen Dd in the shower but when she dies she uses all the hot water and as we don't have a combi boiler, once it's gone it's gone. I shower ds as he's not able to do it himself (properly) so he's quick. I'm as quick as I can be. Dd will spend as long as she can in there until the water starts cooling. Our gas costs have doubled and therefore I don't want to put the water on for longer each day or have to boost it.
What will make her speed up?