Hi @Andrei405
I have been to Crete and loved it! Good luck with your Airbnb.
There is no answer for your question really, it depends on so many things. Look at the calendars of other Airbnb's in your area to get an idea of how busy they are and also if you are priced right for what you offer. After you have a few reviews you should get more bookings. At the beginning its best to have shorter stays to get more reviews.
I know you didn't ask for a critique of your listings but one thing I would do is make the beds look more inviting- in the one bedroom listing there are no bedside tables/lamps and in the 2 bedroom listing it looks like the beds only have sheets on them??