Hi @eirik thanks for the question. There is no deadline. The contract is already deployed in koinos (with the koins), so it will be there forever waiting the input from the holders to release the koins.
I also created the webpage (to interact with the contract) in github pages (https://joticajulian.github.io/wkoin-claim/). So as long as github don't change their policies about free hosting it will be ok.
Thank you, very cool!