Hi ! I don't know of any time limit - but I imagine there probably be one. They are doing this to help spread more of the coin - and so I doubt it will be going on forever. i guess it's up to you and how far away you think you are from hitting 50.
I knew I was only a day or two away from 70 - which is why I waited. If it was much longer than that - I probably wouldn't have.
Either way - good luck with your decision! If you need a sponser - let me know. :)
RE: Complete Walk Through On How To Claim your ByteBall Airdrop!