Alright, based on that resounding silence, I have decided to have a single week for volume 4.
Next week (from tomorrow) will be the last week of volume 3, as planned, then one week later we (?) will have the entirety of volume 4 and finish the series.
The main reason I made it that way instead of stopping everything right this instant is to give at least two weeks to set up the next books (although itโs fine to start earlier if people want to).