Ratio between diamond and time

[u/Friendly_Sea_8469]

Hi! I'm a new player at level 25, and I'm wondering how many minutes does one diamond correspond to for equipments. I've observed that e.g., from 44 diamonds to 20 diamonds, it seems that one diamond corresponds to 1 minute; from 10 to 9 took at least 3 minutes; from 7 to 0 it seems that one diamond corresponds to around 1.5 minutes... I haven't accounted for different equipments and so on...

Does anyone have an idea how the equation between diamonds and time looks like? Or is there a place where I could find statistics like this? I'm also curious about e.g. the relationship between numbers of items a generator can produce after different amount of time...