>>536868665
>spurt: 20-40%
>long: 20-25%
>stamina: 20%
>ura finale: 20-40%
hitting all of them in a single run is 0.8% chance
I'm assuming you're not happy with just 1* stamina, so lets increase that to 2* or above stamina
and also that you don't actually have a parent/grandparents that all have spurt/ura finale spark already, but maybe 1 or 2 of them do
>2*+ stamina: 10.1% (600+ stamina in the end)
>spurt 25%
>ura finale 25%
this gives 0.15% chance, on average you would need 633 runs to get one perfect parent (which is just 2* stamina)
good luck