I'm still a Member and can not use the avatar, but I'll be part of the 3rd airdrop! The 100k that will be distributed, it's necessary how many days of signature to be able to receive some amount? It's a pretty nice airdrop.

You don't have to wait much if you apply the airdrop 1 day before the pay day, you should be included that round payments. It's possible you apply some time in 3 Aug and be paid at 4 Aug 09:30 UTC if you have 10 valid posts (like any active users can have) And you can do what ever you like but with FREE ONIONs we delivered but if you need more, we ask you to hold some percentage and carry on activities. So we can protect our community.
regarding the vote central: Did I get it right, that only users who participate from the first to the 40th round do get right to vote? If so, what do we do, if like only 5 people do manage to get all 40 airdrops? Will only them be able to vote?
No we will invite ALL and any ONION holders. You will need to prove your balance that's all. And you will have that weight impact at the results. We will put initial ONIONs from the bounty wallet and people will vote and decide how to spend and which project. We will use some percentage of bounty on those upcoming projects we believe supportive the expansion. Later people will donate. All your VOTEs will be carried over the TOR network so we don't know who voted and you will be secure for this reason. We want to create eco system that can create lots of useful promotions and activities for the ONIONs future.
It's a service like current AirDrop project, it's actually the first project in it's kind. We help ONION holders to win. It's designed to make the ONION success. We plan to do VOTE central servicing those ONION holders at the future steps of expansion. And people are not limited only AirDrop participants. There are miners and other investor type people can have a say for the coin future projects.