Penalty for DAD who breaks the contract

[Rosa2020]

My 7 years old child just adores to spend time with her dad, but he comes home late and tired, has his dinner and goes to his computer and spends the next couple of hours there. It means he spends with us during the week just 30 minutes/1hr a day. Some days he reads our daughter night time stories.

But one day my daughter came up with an unusual idea: she wrote a contract where she stated:
Dad, mum, we have to do at least 2 working days Family days, which means NO COMPUTER and MOBILE PHONES. These days will be Tuesday and Thursday. Me after the school and you after the work should be together. Please sign here....
So did we.

However she forgot the important point. What happens if we won't hold our promise - what would be the penalty?

Her dad is trying to follow that routine but not always, so my little princess is getting disappointed and upset.
She can't think of what to do when he breaks the contract...

Poor dad
works whole day long and has to spend time with his family in the evening. Perhaps you should explain your DD that he has to have his time after coming home.

Poor thing. It's awkward but sometimes you need some space after work, but also she clearly wants to spend time with her dad. Could you compromise so he has his own space for half an hour and then family time. Or perhaps if he breaks the contract it's 50p or £1 in a jar and that money is for something family centred?

Cappucino, her dad has 1 day off a week, so she miss him a lot. Therefore I think me and my partner have to be there for our child and it's very important for her future as well.
MrsMummyP, thanks for your suggestion. I also thought so at the begin but it can't solve the problem :(
If money would be a solution.......... a lot of things would have been different. My daughter doesn't like saving really. Whenever she get coins she donates to homeless or any charity.