There’s no set formula as to how much fun money should be, and the amount depends on your income, your other financial obligations, your debts and your long-term financial goals. Ideally, it should be at least 10% of your income but no more than 30%.
How much do you prioritise your spending on fun things?
A lot. If if can’t enjoy the money I earn, I don’t realise the true benefits of earning it. I spend a lot on “fun” because it keeps me happy, keeps me earning, and when I reach my goals I won’t be a miserable grump trying to enjoy them 
I will put a little aside each month to go towards fun things. Prefer to plan ahead with things like that. But saying that spur of the moment I have thought let us do it and just done it. But that doesn’t happen often.
@Everybitcounts I do the same. I very rarely try to buy what I just want because then I often regret this purchase.
Yes I can totally understand that.
it’s so important to treat yourself well, not to just focus on money and work.