Length of time for new listings

Hello. I want to know a few things:

  1. How long new listings are indicated as such on the search page?
  2. Is there a way to set a filter through new listings (i.e. if there are, say, 20 new listings, can I filter through them by date, city, country, etc.)?
  3. If I save a profile that does not currently have a housesit listing, I understand that I will get a notification when they have one. Is that notification separate from a notification for a filter I may have set, for example, for a date range?

Thanks and I’m enjoying learning how to participate in this forum!