I have a similar issue with expiration dates/times/policies.
I have a request from a guest in Australia, I'm hosting in Canada. There is a 12 hour clock difference so email response is going to be lengthy at the best of times. Her request comes in at 5 am my time but I have a busy day working and no time for personal email. I respond at 5pm in the afternoon and ask her to clarify who is coming. I don't get her response until next morning by which time the request has passed 24 hours and AirBnb expires the request and sends me a 'shame on you' notice "If another request expires, up to one week of the requested dates will remain blocked on your calendar." which I take to be a penalty threat. My issue isn't with the guest, it is with Airbnb. I answered the guest (upon hearing who was coming) and pre-approved her and her party if they choose to re-submit the request.
I'm a reasonably busy Airbnb traveller and host and my response stats are good. The notice by Airbnb is inappropriate.
This shouldn't really be posted as a reply to Jana, but is really an attempt to say something to Airbnb, which is exceedingly hard to do on their site.