Hi there 
Michael from DFINITY here.
“So, basically I have now 16 hours to find how to claim??”
No… your seed phrase will still be valid even if the proposal passes. If ideal [for you], you can still wait to claim your voting neurons/governance tokens.
“Can someone confirm that when I hold valid seed round I will be able to claim my neurons? and also will these neurons continue to earn?”
Yes… you will still be able to use your seed phrase to access your seed round neurons, which will continue to generate governance rewards.
Hope that helps 