@Rafael-J3
I just did a stab in the dark, to be honest. I set a 10% weekly discount and a 15% monthly discount. I know some hosts discount up to 40% for a monthly stay, but I've never quite understood that.
The only reason that I can see for doing that is if you have a slim chance of filling up the calendar with short stays. So, for example, if the location is seasonal and you only get short term travellers certain months of the year, you could offer a heftier discount for the other months rather than leave the listing empty. Or, if you only get a scattering of bookings, a long term stay seems more attractive and worth discounting heavily.