It gives 1250 twice a day, every day until the event ends.Too much work for 1,250 flags, so I'm going to pass.
I'm also still disappointed that all of my 18th Birthday items were removed from my inventory after the last competition. I answered the final question incorrectly, but I had already qualified for the original prize. The event itself was confusing, as there were no clear instructions about there being a time limit to claim the reward.
Because of how that was handled, I'll be sitting this flag event out. Thank you.
In that contest, the final question had the info that it needs to be correct, or you won't win anything. Some players mistakenly got the reward, due to a handling error, therefore we removed those items, as were never intended to receive them according to the 18th birthday contest rules.