No, your 15 days don’t vanish completely.

You only “spend” the Alpha Points you’ve accumulated — for example, 210 points on one airdrop.

After that, you keep earning points daily as usual.

So yes, realistically, if each airdrop costs 210 points, you can join around 2 per month (every 15 days), as long as you maintain the same daily point rate.

Pro tip:

Keep farming 13–15 points daily to always stay ready for the next drop.