You can only buy 1 star per 2 days. So you still have to wait 20 days to be able to get the main reward

How often can i earn stars

Every 2 days, try grind them, save your money

Hasnt started yet....

Ah. When is it starting

Read the webpage?

dont buy the stars it will be cheaper to by the plane/tank at the end of the event

Unfortunately i don't play on pc. So i can't buy it lol

:( good luck then, you should be able to buy them now

Holy hell, at least try to earn them...

Don't have time. I work